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Earth’s structure & plate boundaries

Examine Earth’s internal layers, tectonic plate boundaries and the rock cycle. Review suitability for your learners before teaching.

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Worksheet StudioPractice pack · Ages 16-18

Earth’s structure & plate boundaries

Take your time. Show your thinking.

1. What ocean wave can be triggered when a powerful submarine earthquake vertically displaces the seafloor: a tsunami or a spring tide?
What ocean wave can be tri… · Earth’s structure & plate …
2. What generates Earth’s global magnetic field (magnetosphere): convection of liquid metal in the outer core, or ocean tides?
What generates Earth’s glo… · Earth’s structure & plate …
3. What do we call molten rock while it is still beneath Earth’s surface, before it erupts as lava: magma or shale?
What do we call molten roc… · Earth’s structure & plate …
4. When slow-cooling magma solidifies deep underground (such as granite), does it form large visible crystals or no crystals?
When slow-cooling magma so… · Earth’s structure & plate …
5. Which seismic body waves travel fastest through the Earth and can pass through both solids and liquids: P-waves (primary) or S-waves (secondary)?
Which seismic body waves t… · Earth’s structure & plate …
6. What type of plate boundary occurs where two plates slide horizontally past each other (such as the San Andreas Fault): transform or divergent?
What type of plate boundar… · Earth’s structure & plate …
7. What instrument records the ground vibrations (seismic waves) produced by an earthquake: a seismometer or a barometer?
What instrument records th… · Earth’s structure & plate …
8. Which type of crust is denser and thinner, causing it to subduct beneath continental crust: oceanic crust or continental crust?
Which type of crust is den… · Earth’s structure & plate …
9. What class of rock forms from the compaction and cementation of deposited layers of sand, silt or shells (e.g. sandstone and limestone): sedimentary or metamorphic?
What class of rock forms f… · Earth’s structure & plate …
10. Why are fossils almost always found in sedimentary rock rather than igneous rock: molten magma destroys organic remains, or sedimentary rock forms in volcanoes?
Why are fossils almost alw… · Earth’s structure & plate …
11. What process breaks rocks down in situ at Earth’s surface through rain, frost and plant roots before erosion transports the fragments: weathering or subduction?
What process breaks rocks … · Earth’s structure & plate …
12. Which thick layer lies directly beneath Earth’s crust and makes up most of Earth’s volume: the mantle or the outer core?
Which thick layer lies dir… · Earth’s structure & plate …

12 questions · Seed 51 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 16-18

Earth’s structure & plate boundaries

Answers and reasoning. Review before teaching.

1. What ocean wave can be triggered when a powerful submarine earthquake vertically displaces the seafloor: a tsunami or a spring tide?
Tsunami
Sudden vertical displacement of the seabed displaces a huge volume of water, generating a tsunami.
2. What generates Earth’s global magnetic field (magnetosphere): convection of liquid metal in the outer core, or ocean tides?
Convection of liquid metal in the outer core
The geodynamo is driven by convective motion of electrically conducting liquid iron in the outer core.
3. What do we call molten rock while it is still beneath Earth’s surface, before it erupts as lava: magma or shale?
Magma
Molten rock underground is called magma; once it erupts onto the surface it is called lava.
4. When slow-cooling magma solidifies deep underground (such as granite), does it form large visible crystals or no crystals?
Large visible crystals
Slow cooling gives mineral crystals time to grow large (coarse-grained).
5. Which seismic body waves travel fastest through the Earth and can pass through both solids and liquids: P-waves (primary) or S-waves (secondary)?
P-waves (primary)
Compressional P-waves are the fastest seismic waves and travel through both solid rock and liquid core.
6. What type of plate boundary occurs where two plates slide horizontally past each other (such as the San Andreas Fault): transform or divergent?
Transform
Transform boundaries involve horizontal shear motion without creating or destroying crust.
7. What instrument records the ground vibrations (seismic waves) produced by an earthquake: a seismometer or a barometer?
Seismometer
A seismometer (seismograph) detects and records seismic waves.
8. Which type of crust is denser and thinner, causing it to subduct beneath continental crust: oceanic crust or continental crust?
Oceanic crust
Basaltic oceanic crust (≈3.0 g/cm³) is denser than granitic continental crust (≈2.7 g/cm³).
9. What class of rock forms from the compaction and cementation of deposited layers of sand, silt or shells (e.g. sandstone and limestone): sedimentary or metamorphic?
Sedimentary
Sedimentary rocks form from accumulated mineral or organic sediments.
10. Why are fossils almost always found in sedimentary rock rather than igneous rock: molten magma destroys organic remains, or sedimentary rock forms in volcanoes?
Molten magma destroys organic remains
Sedimentary layers gently bury organisms, whereas extreme igneous heat destroys them.
11. What process breaks rocks down in situ at Earth’s surface through rain, frost and plant roots before erosion transports the fragments: weathering or subduction?
Weathering
Weathering breaks rock down in place; erosion moves the weathered material.
12. Which thick layer lies directly beneath Earth’s crust and makes up most of Earth’s volume: the mantle or the outer core?
The mantle
The silicate mantle extends from the base of the crust down to about 2,900 km.

12 questions · Seed 51 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 16-18

Earth’s structure & plate boundaries

Take your time. Show your thinking.

1. What ocean wave can be triggered when a powerful submarine earthquake vertically displaces the seafloor: a tsunami or a spring tide?
What ocean wave can be tri… · Earth’s structure & plate …
2. What generates Earth’s global magnetic field (magnetosphere): convection of liquid metal in the outer core, or ocean tides?
What generates Earth’s glo… · Earth’s structure & plate …
3. What do we call molten rock while it is still beneath Earth’s surface, before it erupts as lava: magma or shale?
What do we call molten roc… · Earth’s structure & plate …
4. When slow-cooling magma solidifies deep underground (such as granite), does it form large visible crystals or no crystals?
When slow-cooling magma so… · Earth’s structure & plate …
5. Which seismic body waves travel fastest through the Earth and can pass through both solids and liquids: P-waves (primary) or S-waves (secondary)?
Which seismic body waves t… · Earth’s structure & plate …
6. What type of plate boundary occurs where two plates slide horizontally past each other (such as the San Andreas Fault): transform or divergent?
What type of plate boundar… · Earth’s structure & plate …
7. What instrument records the ground vibrations (seismic waves) produced by an earthquake: a seismometer or a barometer?
What instrument records th… · Earth’s structure & plate …
8. Which type of crust is denser and thinner, causing it to subduct beneath continental crust: oceanic crust or continental crust?
Which type of crust is den… · Earth’s structure & plate …
9. What class of rock forms from the compaction and cementation of deposited layers of sand, silt or shells (e.g. sandstone and limestone): sedimentary or metamorphic?
What class of rock forms f… · Earth’s structure & plate …
10. Why are fossils almost always found in sedimentary rock rather than igneous rock: molten magma destroys organic remains, or sedimentary rock forms in volcanoes?
Why are fossils almost alw… · Earth’s structure & plate …
11. What process breaks rocks down in situ at Earth’s surface through rain, frost and plant roots before erosion transports the fragments: weathering or subduction?
What process breaks rocks … · Earth’s structure & plate …
12. Which thick layer lies directly beneath Earth’s crust and makes up most of Earth’s volume: the mantle or the outer core?
Which thick layer lies dir… · Earth’s structure & plate …

12 questions · Seed 51 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 16-18

Earth’s structure & plate boundaries

Answers and reasoning. Review before teaching.

1. What ocean wave can be triggered when a powerful submarine earthquake vertically displaces the seafloor: a tsunami or a spring tide?
Tsunami
Sudden vertical displacement of the seabed displaces a huge volume of water, generating a tsunami.
2. What generates Earth’s global magnetic field (magnetosphere): convection of liquid metal in the outer core, or ocean tides?
Convection of liquid metal in the outer core
The geodynamo is driven by convective motion of electrically conducting liquid iron in the outer core.
3. What do we call molten rock while it is still beneath Earth’s surface, before it erupts as lava: magma or shale?
Magma
Molten rock underground is called magma; once it erupts onto the surface it is called lava.
4. When slow-cooling magma solidifies deep underground (such as granite), does it form large visible crystals or no crystals?
Large visible crystals
Slow cooling gives mineral crystals time to grow large (coarse-grained).
5. Which seismic body waves travel fastest through the Earth and can pass through both solids and liquids: P-waves (primary) or S-waves (secondary)?
P-waves (primary)
Compressional P-waves are the fastest seismic waves and travel through both solid rock and liquid core.
6. What type of plate boundary occurs where two plates slide horizontally past each other (such as the San Andreas Fault): transform or divergent?
Transform
Transform boundaries involve horizontal shear motion without creating or destroying crust.
7. What instrument records the ground vibrations (seismic waves) produced by an earthquake: a seismometer or a barometer?
Seismometer
A seismometer (seismograph) detects and records seismic waves.
8. Which type of crust is denser and thinner, causing it to subduct beneath continental crust: oceanic crust or continental crust?
Oceanic crust
Basaltic oceanic crust (≈3.0 g/cm³) is denser than granitic continental crust (≈2.7 g/cm³).
9. What class of rock forms from the compaction and cementation of deposited layers of sand, silt or shells (e.g. sandstone and limestone): sedimentary or metamorphic?
Sedimentary
Sedimentary rocks form from accumulated mineral or organic sediments.
10. Why are fossils almost always found in sedimentary rock rather than igneous rock: molten magma destroys organic remains, or sedimentary rock forms in volcanoes?
Molten magma destroys organic remains
Sedimentary layers gently bury organisms, whereas extreme igneous heat destroys them.
11. What process breaks rocks down in situ at Earth’s surface through rain, frost and plant roots before erosion transports the fragments: weathering or subduction?
Weathering
Weathering breaks rock down in place; erosion moves the weathered material.
12. Which thick layer lies directly beneath Earth’s crust and makes up most of Earth’s volume: the mantle or the outer core?
The mantle
The silicate mantle extends from the base of the crust down to about 2,900 km.

12 questions · Seed 51 · Age guidance, not curriculum certification