Compare igneous, sedimentary and metamorphic rocks, fossil formation, permeability and soil horizons. Review suitability for your learners before teaching.
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Worksheet StudioPractice pack · Ages 7-9
Rocks, fossils & soil layers
Take your time. Show your thinking.
1. What is the difference between “weathering” and “erosion” of rocks: weathering is the breakdown of rock in place, whereas erosion is the wearing away and transport of rock fragments by water, wind or ice, or they mean melting?
Topsoil → Subsoil → Bedrock
2. Which sedimentary rock is formed mainly from the calcium carbonate shells and skeletons of marine organisms and coral: limestone (and chalk) or granite?
Topsoil → Subsoil → Bedrock
3. Why do pebbles on a beach or riverbed become smooth and rounded over time: waves and currents tumble the stones against each other, wearing off sharp corners by attrition and abrasion, or people polish every stone?
Topsoil → Subsoil → Bedrock
4. When fine-grained mudstone or shale is compressed by mountain-building forces, what metamorphic rock does it form that splits into flat, waterproof sheets used for roofing: slate or chalk?
Topsoil → Subsoil → Bedrock
5. When water seeps into a crack in a rock, freezes into ice overnight and expands by about 9%, wedging the rock apart, what type of physical weathering is this: freeze-thaw (frost wedging) or photosynthesis?
Topsoil → Subsoil → Bedrock
6. Which soil type has large, gritty particles with big air spaces so water drains through it very quickly: sandy soil or clay soil?
Topsoil → Subsoil → Bedrock
7. Which rock group forms over millions of years when layers of sand, mud, pebbles or shells are compacted and cemented together (such as sandstone, limestone and shale): sedimentary rock or igneous rock?
Topsoil → Subsoil → Bedrock
8. What do we call a rock that has tiny connected pores or spaces that allow water to soak and pass through it (such as sandstone or chalk): a permeable (porous) rock or an impermeable rock?
Topsoil → Subsoil → Bedrock
9. When limestone is subjected to high heat and pressure inside Earth’s crust, what hard, crystalline metamorphic rock does it turn into (often used for statues and tiles): marble or sandstone?
Topsoil → Subsoil → Bedrock
10. What is the dark, nutrient-rich organic material in topsoil formed from decomposed leaves, roots and animal remains: humus or magma?
Topsoil → Subsoil → Bedrock
11. Why does intrusive igneous rock like granite have large, visible mineral crystals, whereas extrusive basalt has tiny crystals: granite cooled slowly deep underground, giving crystals time to grow, or granite is made of sand?
Topsoil → Subsoil → Bedrock
12. How do earthworms help keep garden and farm soil healthy for plants: their burrows let air and rainwater reach roots, and their castings enrich the soil with nutrients, or they eat rocks into lava?
Topsoil → Subsoil → Bedrock
12 questions · Seed 48 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Rocks, fossils & soil layers
Answers and reasoning. Review before teaching.
1. What is the difference between “weathering” and “erosion” of rocks: weathering is the breakdown of rock in place, whereas erosion is the wearing away and transport of rock fragments by water, wind or ice, or they mean melting?
Weathering is the breakdown of rock in place, whereas erosion is the wearing away and transport of rock fragments by water, wind or ice
Weathering breaks rock down in situ; erosion moves the loosened sediment away.
2. Which sedimentary rock is formed mainly from the calcium carbonate shells and skeletons of marine organisms and coral: limestone (and chalk) or granite?
Limestone (and chalk)
Limestone is a carbonate sedimentary rock built from ancient marine shells and coral reefs.
3. Why do pebbles on a beach or riverbed become smooth and rounded over time: waves and currents tumble the stones against each other, wearing off sharp corners by attrition and abrasion, or people polish every stone?
Waves and currents tumble the stones against each other, wearing off sharp corners by attrition and abrasion
Moving water knocks rock fragments together (attrition), rounding sharp edges into smooth pebbles and sand.
4. When fine-grained mudstone or shale is compressed by mountain-building forces, what metamorphic rock does it form that splits into flat, waterproof sheets used for roofing: slate or chalk?
Slate
Slate is a foliated, impermeable metamorphic rock that cleaves into flat tiles.
5. When water seeps into a crack in a rock, freezes into ice overnight and expands by about 9%, wedging the rock apart, what type of physical weathering is this: freeze-thaw (frost wedging) or photosynthesis?
Freeze-thaw (frost wedging)
Water expands as it freezes, exerting strong pressure that widens rock cracks over repeated cycles.
6. Which soil type has large, gritty particles with big air spaces so water drains through it very quickly: sandy soil or clay soil?
Sandy soil
Sand grains are relatively large, creating wide pore spaces that drain water rapidly.
7. Which rock group forms over millions of years when layers of sand, mud, pebbles or shells are compacted and cemented together (such as sandstone, limestone and shale): sedimentary rock or igneous rock?
Sedimentary rock
Sedimentary rocks form in layers (strata) from deposited and lithified sediments.
8. What do we call a rock that has tiny connected pores or spaces that allow water to soak and pass through it (such as sandstone or chalk): a permeable (porous) rock or an impermeable rock?
Permeable (porous) rock
Permeable rocks have interconnected pore spaces or fractures that let water percolate through.
9. When limestone is subjected to high heat and pressure inside Earth’s crust, what hard, crystalline metamorphic rock does it turn into (often used for statues and tiles): marble or sandstone?
Marble
Marble is metamorphosed limestone.
10. What is the dark, nutrient-rich organic material in topsoil formed from decomposed leaves, roots and animal remains: humus or magma?
Humus
Humus retains moisture and supplies essential mineral nutrients to growing plant roots.
11. Why does intrusive igneous rock like granite have large, visible mineral crystals, whereas extrusive basalt has tiny crystals: granite cooled slowly deep underground, giving crystals time to grow, or granite is made of sand?
Granite cooled slowly deep underground, giving crystals time to grow
Slow cooling of magma underground allows large interlocking crystals to form; lava on the surface cools rapidly into tiny crystals.
12. How do earthworms help keep garden and farm soil healthy for plants: their burrows let air and rainwater reach roots, and their castings enrich the soil with nutrients, or they eat rocks into lava?
Their burrows let air and rainwater reach roots, and their castings enrich the soil with nutrients
Earthworms aerate the soil, improve drainage and recycle organic matter into plant nutrients.
12 questions · Seed 48 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Rocks, fossils & soil layers
Take your time. Show your thinking.
1. What is the difference between “weathering” and “erosion” of rocks: weathering is the breakdown of rock in place, whereas erosion is the wearing away and transport of rock fragments by water, wind or ice, or they mean melting?
Topsoil → Subsoil → Bedrock
2. Which sedimentary rock is formed mainly from the calcium carbonate shells and skeletons of marine organisms and coral: limestone (and chalk) or granite?
Topsoil → Subsoil → Bedrock
3. Why do pebbles on a beach or riverbed become smooth and rounded over time: waves and currents tumble the stones against each other, wearing off sharp corners by attrition and abrasion, or people polish every stone?
Topsoil → Subsoil → Bedrock
4. When fine-grained mudstone or shale is compressed by mountain-building forces, what metamorphic rock does it form that splits into flat, waterproof sheets used for roofing: slate or chalk?
Topsoil → Subsoil → Bedrock
5. When water seeps into a crack in a rock, freezes into ice overnight and expands by about 9%, wedging the rock apart, what type of physical weathering is this: freeze-thaw (frost wedging) or photosynthesis?
Topsoil → Subsoil → Bedrock
6. Which soil type has large, gritty particles with big air spaces so water drains through it very quickly: sandy soil or clay soil?
Topsoil → Subsoil → Bedrock
7. Which rock group forms over millions of years when layers of sand, mud, pebbles or shells are compacted and cemented together (such as sandstone, limestone and shale): sedimentary rock or igneous rock?
Topsoil → Subsoil → Bedrock
8. What do we call a rock that has tiny connected pores or spaces that allow water to soak and pass through it (such as sandstone or chalk): a permeable (porous) rock or an impermeable rock?
Topsoil → Subsoil → Bedrock
9. When limestone is subjected to high heat and pressure inside Earth’s crust, what hard, crystalline metamorphic rock does it turn into (often used for statues and tiles): marble or sandstone?
Topsoil → Subsoil → Bedrock
10. What is the dark, nutrient-rich organic material in topsoil formed from decomposed leaves, roots and animal remains: humus or magma?
Topsoil → Subsoil → Bedrock
11. Why does intrusive igneous rock like granite have large, visible mineral crystals, whereas extrusive basalt has tiny crystals: granite cooled slowly deep underground, giving crystals time to grow, or granite is made of sand?
Topsoil → Subsoil → Bedrock
12. How do earthworms help keep garden and farm soil healthy for plants: their burrows let air and rainwater reach roots, and their castings enrich the soil with nutrients, or they eat rocks into lava?
Topsoil → Subsoil → Bedrock
12 questions · Seed 48 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Rocks, fossils & soil layers
Answers and reasoning. Review before teaching.
1. What is the difference between “weathering” and “erosion” of rocks: weathering is the breakdown of rock in place, whereas erosion is the wearing away and transport of rock fragments by water, wind or ice, or they mean melting?
Weathering is the breakdown of rock in place, whereas erosion is the wearing away and transport of rock fragments by water, wind or ice
Weathering breaks rock down in situ; erosion moves the loosened sediment away.
2. Which sedimentary rock is formed mainly from the calcium carbonate shells and skeletons of marine organisms and coral: limestone (and chalk) or granite?
Limestone (and chalk)
Limestone is a carbonate sedimentary rock built from ancient marine shells and coral reefs.
3. Why do pebbles on a beach or riverbed become smooth and rounded over time: waves and currents tumble the stones against each other, wearing off sharp corners by attrition and abrasion, or people polish every stone?
Waves and currents tumble the stones against each other, wearing off sharp corners by attrition and abrasion
Moving water knocks rock fragments together (attrition), rounding sharp edges into smooth pebbles and sand.
4. When fine-grained mudstone or shale is compressed by mountain-building forces, what metamorphic rock does it form that splits into flat, waterproof sheets used for roofing: slate or chalk?
Slate
Slate is a foliated, impermeable metamorphic rock that cleaves into flat tiles.
5. When water seeps into a crack in a rock, freezes into ice overnight and expands by about 9%, wedging the rock apart, what type of physical weathering is this: freeze-thaw (frost wedging) or photosynthesis?
Freeze-thaw (frost wedging)
Water expands as it freezes, exerting strong pressure that widens rock cracks over repeated cycles.
6. Which soil type has large, gritty particles with big air spaces so water drains through it very quickly: sandy soil or clay soil?
Sandy soil
Sand grains are relatively large, creating wide pore spaces that drain water rapidly.
7. Which rock group forms over millions of years when layers of sand, mud, pebbles or shells are compacted and cemented together (such as sandstone, limestone and shale): sedimentary rock or igneous rock?
Sedimentary rock
Sedimentary rocks form in layers (strata) from deposited and lithified sediments.
8. What do we call a rock that has tiny connected pores or spaces that allow water to soak and pass through it (such as sandstone or chalk): a permeable (porous) rock or an impermeable rock?
Permeable (porous) rock
Permeable rocks have interconnected pore spaces or fractures that let water percolate through.
9. When limestone is subjected to high heat and pressure inside Earth’s crust, what hard, crystalline metamorphic rock does it turn into (often used for statues and tiles): marble or sandstone?
Marble
Marble is metamorphosed limestone.
10. What is the dark, nutrient-rich organic material in topsoil formed from decomposed leaves, roots and animal remains: humus or magma?
Humus
Humus retains moisture and supplies essential mineral nutrients to growing plant roots.
11. Why does intrusive igneous rock like granite have large, visible mineral crystals, whereas extrusive basalt has tiny crystals: granite cooled slowly deep underground, giving crystals time to grow, or granite is made of sand?
Granite cooled slowly deep underground, giving crystals time to grow
Slow cooling of magma underground allows large interlocking crystals to form; lava on the surface cools rapidly into tiny crystals.
12. How do earthworms help keep garden and farm soil healthy for plants: their burrows let air and rainwater reach roots, and their castings enrich the soil with nutrients, or they eat rocks into lava?
Their burrows let air and rainwater reach roots, and their castings enrich the soil with nutrients
Earthworms aerate the soil, improve drainage and recycle organic matter into plant nutrients.
12 questions · Seed 48 · Age guidance, not curriculum certification