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13 Cards in this Set
- Front
- Back
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soil
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The loose material on the earth's surface.
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humus
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The part of topsoil formed from the remains of living things that have died and decayed.
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topsoil
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The top layer of soil. Plants grow in this layer.
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subsoil
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The second layer of soil, which contains large pieces of rock.
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bedrock
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The layer of large, unbroken rock underneath the subsoil.
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weathering
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The breaking down of rock.
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rock
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A hard piece of the earth's surface.
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igneous rock
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Rock formed when hot, melted rock cools and hardens.
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volcano
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An opening in the earth that allows melted rock to come to the surface.
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sedimentary rock
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Rock formed when layers of sediment are pressed together and harden.
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metamorphic rock
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Rock formed when an igneous or sedimentary rock is changed by great heat and pressure.
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fossil
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Any part or make of a living thing that is naturally preserved after it dies.
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minerals
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Are solid materials in nature that were never alive.
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