Earth Structure, Rocks & Minerals MCQs 2026

61 questions with detailed answers · 0 from past papers · 7 quiz batches available

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Page 1 of 1 Questions 1–10 of 61

Q1 medium

What ancient supercontinent, proposed by Wegener's theory, is believed to have contained all of Earth's current continents joined together
1. A Pangaea
2. B Gondwana (a later, partial supercontinent, formed after Pangaea's breakup)
3. C Laurasia (a later, partial supercontinent, formed after Pangaea's breakup)
4. D Atlantis (a mythical, not scientifically recognized, lost continent)
💡 Explanation:
Pangaea is the ancient supercontinent believed to have contained all of Earth's current continents joined together before breaking apart.
Q2 medium

What are the boundaries where tectonic plates move toward and collide with each other called
1. A Divergent boundaries (plates moving apart, opposite type)
2. B Convergent boundaries
3. C Transform boundaries (plates sliding past each other, a different type)
4. D Rift zones (a specific feature often associated with divergent boundaries)
💡 Explanation:
Convergent boundaries occur where tectonic plates move toward and collide with each other.
Q3 medium

What are the boundaries where tectonic plates slide horizontally past each other called
1. A Divergent boundaries (plates moving apart, a different type)
2. B Convergent boundaries (plates moving together, a different type)
3. C Transform boundaries
4. D Subduction zones (a specific feature typically associated with convergent boundaries)
💡 Explanation:
Transform boundaries occur where tectonic plates slide horizontally past each other.
Q4 medium

What geological process occurs when one tectonic plate is forced beneath another at a convergent boundary
1. A Rifting (associated with divergent boundaries, different process)
2. B Subduction
3. C Faulting (a broader term for crustal fracturing, related but distinct)
4. D Folding (a different process, relating to rock layer deformation)
💡 Explanation:
Subduction occurs at convergent boundaries when one tectonic plate is forced beneath another.
Q5 medium

What famous fault system, running through California, is a well-known example of a transform boundary
1. A San Andreas Fault
2. B Ring of Fire (a broader region of seismic/volcanic activity, not a single fault itself)
3. C Mid-Atlantic Ridge (a divergent boundary feature, different location/type)
4. D Mariana Trench (a subduction zone feature, different location/type)
💡 Explanation:
The San Andreas Fault, running through California, is a well-known example of a transform boundary.
Q6 easy

What is the general term for the three main categories of rocks, based on their formation process
1. A Igneous, sedimentary, and metamorphic rocks
2. B Hard, medium, and soft rocks (not a standard scientific classification)
3. C Volcanic, oceanic, and continental rocks (not the standard formation-based classification)
4. D Ancient, modern, and future rocks (not a standard scientific classification)
💡 Explanation:
Rocks are classified into three main categories based on their formation process: igneous, sedimentary, and metamorphic.
Q7 medium

What type of rock forms from the cooling and solidification of molten magma or lava
1. A Sedimentary rock (forms through different processes - accumulation and compaction)
2. B Igneous rock
3. C Metamorphic rock (forms through different processes - heat/pressure transformation)
4. D All three types form this way equally (incorrect - each type has a distinct formation process)
💡 Explanation:
Igneous rock forms from the cooling and solidification of molten magma (underground) or lava (surface).
Q8 medium

What type of rock forms from the accumulation and compaction of sediment, often containing visible layers
1. A Igneous rock (forms through different processes - magma/lava solidification)
2. B Sedimentary rock
3. C Metamorphic rock (forms through different processes - heat/pressure transformation)
4. D All three types form this way equally (incorrect - each type has a distinct formation process)
💡 Explanation:
Sedimentary rock forms from the accumulation and compaction of sediment, often displaying visible layering.
Q9 medium

What type of rock forms when existing rock is transformed by intense heat and/or pressure, without fully melting
1. A Igneous rock (forms through different processes - full melting and solidification)
2. B Sedimentary rock (forms through different processes - accumulation and compaction)
3. C Metamorphic rock
4. D All three types form this way equally (incorrect - each type has a distinct formation process)
💡 Explanation:
Metamorphic rock forms when existing rock is transformed by intense heat and/or pressure, without completely melting.
Q10 medium

What are the boundaries where tectonic plates move apart from each other called
1. A Convergent boundaries (plates moving toward each other, opposite type)
2. B Divergent boundaries
3. C Transform boundaries (plates sliding past each other, a different type)
4. D Subduction zones (a specific feature often associated with convergent boundaries)
💡 Explanation:
Divergent boundaries occur where tectonic plates move apart from each other, often forming new crust.
Q11 medium

Which type of Earth's crust is generally thicker and less dense, forming the continents
1. A Oceanic crust (generally thinner, denser)
2. B Continental crust
3. C Lower crust (not the standard classification)
4. D Mantle crust (not a standard term)
💡 Explanation:
Continental crust is generally thicker and less dense than oceanic crust, forming the continents.
Q12 medium

What common igneous rock, formed from rapidly cooled lava, has a glassy texture and is often black in color
1. A Granite (a different, slowly-cooled igneous rock, different texture)
2. B Obsidian
3. C Basalt (a different, more common volcanic igneous rock, different texture)
4. D Pumice (a different, lightweight volcanic rock with a distinctly porous texture)
💡 Explanation:
Obsidian is a glassy, often black igneous rock formed from very rapidly cooled lava.
Q13 medium

What scientific theory describes Earth's crust as being divided into large moving plates
1. A Continental drift theory (an earlier, related concept)
2. B Plate tectonics theory
3. C Seafloor spreading theory (a related, more specific process contributing to plate tectonics)
4. D Convection theory (relates to the mechanism driving plate movement, a related but distinct concept)
💡 Explanation:
Plate tectonics theory describes Earth's crust as being divided into large moving plates that interact at their boundaries.
Q14 medium

What earlier scientist proposed the concept of continental drift, suggesting continents were once joined together
1. A Alfred Wegener
2. B Charles Darwin (a different scientist, known for evolution theory)
3. C Isaac Newton (a different scientist, known for physics)
4. D Albert Einstein (a different scientist, known for relativity theory)
💡 Explanation:
Alfred Wegener proposed the continental drift theory in the early 20th century, suggesting continents were once joined together.
Q15 easy

What are the four main layers of Earth's internal structure, from outermost to innermost
1. A Crust, mantle, outer core, inner core
2. B Crust, core, mantle, atmosphere
3. C Mantle, crust, inner core, outer core
4. D Atmosphere, crust, mantle, core
💡 Explanation:
Earth's internal structure consists of four main layers: crust, mantle, outer core, and inner core, from outermost to innermost.
Q16 easy

What is the outermost solid layer of Earth, where we live
1. A Crust
2. B Mantle
3. C Outer core
4. D Inner core
💡 Explanation:
The crust is Earth's outermost solid layer, where humans and other life exist.
Q17 medium

What is the thick layer beneath the crust, composed of hot, semi-solid rock
1. A Crust (the outer layer, different from this thicker layer)
2. B Mantle
3. C Outer core (a different, deeper layer)
4. D Inner core (the deepest, different layer)
💡 Explanation:
The mantle is the thick layer beneath the crust, composed of hot, semi-solid rock that can flow slowly over time.
Q18 medium

What is the layer of Earth believed to be liquid, generating Earth's magnetic field through its movement
1. A Crust (the outer, solid layer)
2. B Mantle (the thick layer above the core, semi-solid)
3. C Outer core
4. D Inner core (the deepest layer, believed to be solid)
💡 Explanation:
The outer core is believed to be liquid, and its movement is thought to generate Earth's magnetic field.
Q19 medium

What is the innermost layer of Earth, believed to be solid despite extremely high temperatures, due to immense pressure
1. A Crust (the outer, different layer)
2. B Mantle (a different, outer layer)
3. C Outer core (believed to be liquid, different from this innermost layer)
4. D Inner core
💡 Explanation:
The inner core is Earth's innermost layer, believed to be solid due to immense pressure despite extremely high temperatures.
Q20 medium

What are the two main types of Earth's crust
1. A Oceanic crust and continental crust
2. B Upper crust and lower crust (not the standard primary classification)
3. C Northern crust and southern crust (not a standard classification)
4. D Solid crust and liquid crust (crust is generally solid, not classified this way)
💡 Explanation:
Earth's crust is divided into two main types: oceanic crust (thinner, denser) and continental crust (thicker, less dense).
Q21 medium

Which type of Earth's crust is generally thinner and denser, forming the ocean floors
1. A Continental crust (generally thicker, less dense)
2. B Oceanic crust
3. C Upper crust (not the standard classification)
4. D Mantle crust (not a standard term - mantle and crust are distinct layers)
💡 Explanation:
Oceanic crust is generally thinner and denser than continental crust, forming the ocean floors.
Q22 medium

What mineral is designated as the hardest substance on the Mohs hardness scale, rated at 10
1. A Quartz (a much lower hardness rating on the scale)
2. B Diamond
3. C Talc (the softest mineral, rated at 1)
4. D Corundum (very hard, but rated at 9, one below diamond)
💡 Explanation:
Diamond is designated as the hardest known natural substance, rated at 10 on the Mohs hardness scale.
Q23 medium

What common metamorphic rock forms from the transformation of sandstone under heat and pressure
1. A Marble (forms from a different parent rock - limestone)
2. B Slate (forms from a different parent rock - shale)
3. C Quartzite
4. D Gneiss (forms from a different parent rock - typically granite or similar)
💡 Explanation:
Quartzite is a metamorphic rock that forms from the transformation of sandstone under intense heat and pressure.
Q24 medium

What is the general term for a naturally occurring, inorganic solid with a definite chemical composition and crystalline structure
1. A Rock (typically composed of multiple minerals combined, a broader concept)
2. B Mineral
3. C Ore (specifically a mineral deposit valuable enough to mine economically, a related but narrower concept)
4. D Gem (specifically a mineral valued for beauty/rarity, a related but narrower concept)
💡 Explanation:
A mineral is a naturally occurring, inorganic solid with a definite chemical composition and characteristic crystalline structure.
Q25 medium

What common metamorphic rock forms from the transformation of granite or similar igneous rocks under extreme heat and pressure
1. A Marble (forms from a different parent rock - limestone)
2. B Slate (forms from a different parent rock - shale)
3. C Quartzite (forms from a different parent rock - sandstone)
4. D Gneiss
💡 Explanation:
Gneiss is a metamorphic rock that forms from the transformation of granite or similar igneous rocks under extreme heat and pressure.
Q26 medium

What is the term for the process by which eroded sediment settles and accumulates in a new location
1. A Weathering (relates to the initial breakdown of rock, a different, earlier process)
2. B Erosion (relates to the transport of material, a different, preceding process)
3. C Deposition
4. D Subduction (relates to tectonic plate movement, an entirely different concept)
💡 Explanation:
Deposition refers to the process by which eroded sediment settles and accumulates in a new location, often forming new sedimentary layers.
Q27 medium

What is the term for the process by which weathered rock particles are transported from one location to another by wind, water, or ice
1. A Weathering (relates to the initial breakdown of rock, a different, preceding process)
2. B Erosion
3. C Deposition (relates to settling of transported material, a subsequent, different process)
4. D Metamorphism (relates to rock transformation under heat/pressure, an entirely different concept)
💡 Explanation:
Erosion refers to the process by which weathered rock particles are transported by agents like wind, water, or ice.
Q28 medium

What is the term for the process by which rocks are broken down into smaller particles through physical, chemical, or biological means
1. A Erosion (relates to transport of broken-down material, a related but distinct process)
2. B Weathering
3. C Deposition (relates to settling of transported material, a different, later process)
4. D Sedimentation (relates to the accumulation/layering of sediment, a related but distinct concept)
💡 Explanation:
Weathering refers to the process by which rocks are broken down into smaller particles through physical, chemical, or biological mechanisms.
Q29 hard

What mineral, valued for its distinctive green color from trace chromium or vanadium, is a member of the beryl mineral family
1. A Ruby (a different gemstone, chemically related to sapphire/corundum, different color mechanism)
2. B Emerald
3. C Diamond (a different mineral entirely - pure carbon)
4. D Topaz (a different mineral entirely, different chemical composition)
💡 Explanation:
Emerald, valued for its green color from trace chromium or vanadium, belongs to the beryl mineral family.
Q30 hard

What mineral, chemically identical to sapphire but red in color due to trace chromium, is a highly valued gemstone
1. A Emerald (a different, green-colored gemstone, different mineral composition)
2. B Ruby
3. C Diamond (a different mineral entirely - pure carbon)
4. D Topaz (a different mineral entirely, different chemical composition)
💡 Explanation:
Ruby is chemically identical to sapphire (both are corundum) but appears red due to trace amounts of chromium.
Q31 medium

What is the hardest naturally occurring gemstone, also the hardest substance overall on the Mohs scale
1. A Ruby (very hard, but lower on the scale than diamond)
2. B Diamond
3. C Emerald (softer than diamond on the Mohs scale)
4. D Sapphire (very hard, chemically related to ruby, but lower on the scale than diamond)
💡 Explanation:
Diamond is both the hardest naturally occurring gemstone and the hardest substance overall on the Mohs hardness scale.
Q32 medium

What is the general term for minerals valued for their beauty, rarity, and durability, often used in jewelry
1. A Ore (relates to economically valuable mineral deposits generally, a broader/different concept)
2. B Gemstone
3. C Rock (a broader term for mineral aggregates generally)
4. D Alloy (relates to metal mixtures, an entirely different concept)
💡 Explanation:
Gemstones are minerals specifically valued for their beauty, rarity, and durability, commonly used in jewelry.
Q33 medium

What is the term for a mineral deposit valuable and concentrated enough to be economically mined
1. A Rock (a broader term for mineral aggregates generally)
2. B Ore
3. C Gem (specifically relates to minerals valued for beauty/rarity, a different concept)
4. D Crystal (relates to a mineral's structural form, a different concept)
💡 Explanation:
An ore is specifically a mineral deposit that is valuable and concentrated enough to be economically extracted through mining.
Q34 medium

What mineral is designated as the softest substance on the Mohs hardness scale, rated at 1
1. A Diamond (the hardest mineral, rated at 10)
2. B Quartz (a much higher hardness rating on the scale)
3. C Talc
4. D Corundum (very hard, rated at 9)
💡 Explanation:
Talc is designated as the softest common mineral, rated at 1 on the Mohs hardness scale.
Q35 medium

What scale is commonly used to measure and compare the hardness of minerals
1. A Richter scale (used for earthquakes, unrelated to mineral hardness)
2. B Mohs scale
3. C Beaufort scale (used for wind, unrelated to mineral hardness)
4. D Fujita scale (used for tornadoes, unrelated to mineral hardness)
💡 Explanation:
The Mohs scale is commonly used to measure and compare the relative hardness of different minerals.
Q36 medium

What common sedimentary rock is formed primarily from calcium carbonate, often derived from marine organism shells
1. A Limestone
2. B Sandstone (formed differently, from sand grains)
3. C Shale (formed differently, from clay/mud)
4. D Conglomerate (formed differently, from larger rounded rock fragments)
💡 Explanation:
Limestone is a common sedimentary rock formed primarily from calcium carbonate, often derived from the shells of marine organisms.
Q37 medium

What common metamorphic rock forms from the transformation of limestone under heat and pressure
1. A Slate (forms from a different parent rock - shale)
2. B Marble
3. C Quartzite (forms from a different parent rock - sandstone)
4. D Gneiss (forms from a different parent rock - typically granite or similar)
💡 Explanation:
Marble is a metamorphic rock that forms from the transformation of limestone under intense heat and pressure.
Q38 medium

What common sedimentary rock is formed primarily from compacted clay or mud
1. A Limestone (formed differently, often from calcium carbonate/shell fragments)
2. B Sandstone (formed differently, from sand grains)
3. C Shale
4. D Conglomerate (formed differently, from larger rounded rock fragments)
💡 Explanation:
Shale is a common sedimentary rock formed primarily from compacted clay or mud particles.
Q39 medium

What common sedimentary rock is formed primarily from compacted sand grains
1. A Limestone (formed differently, often from calcium carbonate/shell fragments)
2. B Sandstone
3. C Shale (formed differently, from compacted clay/mud)
4. D Conglomerate (formed differently, from larger rounded rock fragments)
💡 Explanation:
Sandstone is a common sedimentary rock formed primarily from compacted and cemented sand grains.
Q40 medium

What lightweight, porous igneous rock, formed from rapidly cooled frothy lava, can often float on water
1. A Granite (a different, dense igneous rock)
2. B Obsidian (a different, glassy but dense igneous rock)
3. C Basalt (a different, dense igneous rock)
4. D Pumice
💡 Explanation:
Pumice is a lightweight, porous igneous rock formed from rapidly cooled frothy lava, capable of floating on water.
Q41 medium

What common fine-grained, dark-colored igneous rock forms much of the ocean floor
1. A Granite (a different, lighter-colored, coarser igneous rock)
2. B Obsidian (a different, glassy igneous rock)
3. C Basalt
4. D Pumice (a different, lightweight, porous igneous rock)
💡 Explanation:
Basalt is a common fine-grained, dark-colored igneous rock that forms much of the ocean floor.
Q42 medium

What common coarse-grained igneous rock, formed from slowly cooled magma underground, is widely used in countertops and buildings
1. A Obsidian (a different, rapidly-cooled igneous rock, different texture)
2. B Granite
3. C Basalt (a different, finer-grained igneous rock)
4. D Pumice (a different, lightweight volcanic rock)
💡 Explanation:
Granite is a coarse-grained igneous rock, formed from slowly cooled magma, widely used in countertops and building construction.
Q43 medium

What common metamorphic rock forms from the transformation of shale under heat and pressure
1. A Marble (forms from a different parent rock - limestone)
2. B Slate
3. C Quartzite (forms from a different parent rock - sandstone)
4. D Gneiss (forms from a different parent rock - typically granite or similar)
💡 Explanation:
Slate is a metamorphic rock that forms from the transformation of shale under heat and pressure.
Q44 medium

What geological region, encircling much of the Pacific Ocean, is known for frequent volcanic and seismic activity
1. A Ring of Fire
2. B Mid-Atlantic Ridge (a different, more specific tectonic feature, located in a different ocean)
3. C San Andreas Fault (a specific fault line, a smaller-scale feature within the broader Ring of Fire region)
4. D Mariana Trench (a specific deep-sea trench, one feature within the broader Ring of Fire region)
💡 Explanation:
The Ring of Fire is a geological region encircling much of the Pacific Ocean, known for frequent volcanic eruptions and seismic activity.
Q45 hard

What is the specific point beneath Earth's surface where an earthquake originates called
1. A Epicenter (the point directly above the origin, on Earth's surface, a related but distinct term)
2. B Focus (Hypocenter)
3. C Fault line (the broader crack/fracture where movement occurs, related but distinct from this specific origin point)
4. D Seismic zone (a broader region prone to earthquake activity, a related but distinct concept)
💡 Explanation:
The focus, or hypocenter, is the specific point beneath Earth's surface where an earthquake actually originates.
Q46 medium

What is the general scientific field specifically dedicated to studying earthquakes and seismic waves
1. A Geology (a broader field, encompassing this specific study area)
2. B Seismology
3. C Volcanology (studies volcanoes specifically, a related but distinct field)
4. D Meteorology (studies weather/atmosphere, an entirely different field)
💡 Explanation:
Seismology is the specific scientific field dedicated to studying earthquakes and seismic wave activity.
Q47 medium

What is the point on Earth's surface directly above an earthquake's focus called
1. A Focus/Hypocenter (the actual point of origin beneath the surface, a related but distinct term)
2. B Epicenter
3. C Fault line (the broader crack/fracture where movement occurs, related but distinct)
4. D Seismic zone (a broader region prone to earthquake activity, related but distinct)
💡 Explanation:
The epicenter is the point on Earth's surface located directly above an earthquake's focus (hypocenter).
Q48 medium

What large ocean wave, often triggered by underwater earthquakes, can cause devastating coastal flooding
1. A Storm surge (typically associated with hurricanes, a different triggering mechanism)
2. B Tsunami
3. C King tide (a natural, predictable high-tide event, unrelated to earthquake triggers)
4. D Rip current (a localized, different type of dangerous water phenomenon)
💡 Explanation:
A tsunami is a large ocean wave, often triggered by underwater earthquakes, capable of causing devastating coastal flooding.
Q49 medium

What is the term for a large, rapid movement of rock, soil, and debris down a slope, often triggered by heavy rain or earthquakes
1. A Avalanche (a specific type involving snow/ice, a related but distinct phenomenon)
2. B Landslide
3. C Sinkhole (relates to ground collapse into underground cavities, a different phenomenon)
4. D Erosion (a broader, typically slower, ongoing process, distinct from this sudden event)
💡 Explanation:
A landslide is a large, rapid movement of rock, soil, and debris down a slope, often triggered by factors like heavy rain or earthquakes.
Q50 medium

What is the term for a sudden collapse of ground surface into an underground cavity, often related to dissolved limestone or similar rock
1. A Landslide (relates to slope movement, a different phenomenon)
2. B Sinkhole
3. C Avalanche (relates to snow/ice movement, a different phenomenon)
4. D Fault (relates to rock fracturing generally, a broader/different concept)
💡 Explanation:
A sinkhole is a sudden ground collapse into an underground cavity, often related to the dissolution of limestone or similar soluble rock.
Q51 easy

What is the general scientific field dedicated to studying Earth's physical structure, substances, processes, and history
1. A Meteorology (studies weather/atmosphere, a different field)
2. B Geology
3. C Oceanography (studies oceans specifically, a related but narrower field)
4. D Astronomy (studies celestial objects, an entirely different field)
💡 Explanation:
Geology is the scientific field dedicated to studying Earth's physical structure, substances, processes, and geological history.
Q52 easy

What is the term for a sudden release of energy in Earth's crust, causing ground shaking, often due to tectonic plate movement
1. A Volcano (relates to magma/lava eruption, a different geological phenomenon)
2. B Earthquake
3. C Tsunami (a related, potential consequence of certain earthquakes, but a distinct phenomenon itself)
4. D Landslide (a related, potential consequence of earthquakes, but a distinct phenomenon itself)
💡 Explanation:
An earthquake is a sudden release of energy in Earth's crust, causing ground shaking, often resulting from tectonic plate movement.
Q53 medium

What scale is commonly used to measure the magnitude (energy release) of earthquakes
1. A Mohs scale (used for mineral hardness, unrelated to earthquakes)
2. B Richter scale
3. C Beaufort scale (used for wind, unrelated to earthquakes)
4. D Fujita scale (used for tornadoes, unrelated to earthquakes)
💡 Explanation:
The Richter scale is commonly used to measure the magnitude, or energy release, of earthquakes.
Q54 medium

What is the general scientific field specifically dedicated to studying volcanoes and volcanic activity
1. A Geology (a broader field, encompassing this specific study area)
2. B Seismology (studies earthquakes specifically, a related but distinct field)
3. C Volcanology
4. D Meteorology (studies weather/atmosphere, an entirely different field)
💡 Explanation:
Volcanology is the specific scientific field dedicated to studying volcanoes and volcanic activity.
Q55 medium

What instrument is used to detect and measure seismic waves during earthquakes
1. A Barometer (measures atmospheric pressure, an entirely different instrument)
2. B Seismograph
3. C Anemometer (measures wind speed, an entirely different instrument)
4. D Hygrometer (measures humidity, an entirely different instrument)
💡 Explanation:
A seismograph is the instrument used to detect and measure seismic waves generated during earthquakes.
Q56 medium

What is the term for the continuous cycle by which rocks transform between igneous, sedimentary, and metamorphic types over geological time
1. A Water cycle (relates to water movement, a different Earth cycle entirely)
2. B Rock cycle
3. C Carbon cycle (relates to carbon movement through ecosystems, a different Earth cycle entirely)
4. D Nitrogen cycle (relates to nitrogen movement through ecosystems, a different Earth cycle entirely)
💡 Explanation:
The rock cycle describes the continuous transformation of rocks between igneous, sedimentary, and metamorphic types over geological time.
Q57 medium

What geological structure results from layers of rock being folded or bent, often due to tectonic forces
1. A Fault (relates to fracturing/breaking of rock, a different structural feature)
2. B Fold
3. C Volcano (relates to magma/lava eruption, an entirely different geological feature)
4. D Delta (relates to sediment deposition at a river mouth, an entirely different feature)
💡 Explanation:
A fold is a geological structure resulting from rock layers being bent or folded, often due to tectonic compressional forces.
Q58 medium

What geological structure results from rock layers fracturing and displacing relative to each other
1. A Fold (relates to bending of rock layers, a different structural feature)
2. B Fault
3. C Volcano (relates to magma/lava eruption, an entirely different geological feature)
4. D Delta (relates to sediment deposition at a river mouth, an entirely different feature)
💡 Explanation:
A fault is a geological structure resulting from rock layers fracturing and displacing relative to one another.
Q59 easy

What is the term for a mountain or opening in Earth's crust through which molten rock, gases, and ash can erupt
1. A Fold (relates to bending rock layers, a different geological feature)
2. B Fault (relates to fracturing rock layers, a different geological feature)
3. C Volcano
4. D Delta (relates to sediment deposition, an entirely different feature)
💡 Explanation:
A volcano is a mountain or opening in Earth's crust through which molten rock (magma/lava), gases, and ash can erupt.
Q60 medium

What is molten rock called while it remains beneath Earth's surface
1. A Lava (the term used once it reaches the surface)
2. B Magma
3. C Ash (a solid volcanic ejecta material, different from molten rock)
4. D Basalt (a specific type of solidified igneous rock, different from molten rock itself)
💡 Explanation:
Magma refers to molten rock while it remains beneath Earth's surface, becoming lava once it reaches the surface.
Q61 medium

What is molten rock called once it erupts and reaches Earth's surface
1. A Magma (the term used while still beneath the surface)
2. B Lava
3. C Ash (a solid volcanic ejecta material, different from molten rock)
4. D Granite (a specific type of solidified igneous rock, different from molten rock itself)
💡 Explanation:
Lava refers to molten rock once it has erupted and reached Earth's surface, distinguished from magma beneath the surface.

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Earth Structure, Rocks & Minerals MCQs 2026

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