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12 Cards in this Set
- Front
- Back
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liquid rock outside of the earth
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lava
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to slowly break down or rot
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decay
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the decayed remains of plants and animals
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humus
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tightly packed soil with tiny grains
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clay
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rocks that are changed by heat, time or pressure
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metamorphic
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the outermost layer of the earth
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crust
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made when rocks break down and mix with water, air and humus
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soil
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rocks that are formed when magma cools and hardens
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igneous
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a mixture of sand, clay and humus
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loam
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rocks that are formed when layers of materials are pressed together for many years
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sedimentary
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materials that are not alive ,are not plants or animals, and are found in soil, rocks and water
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minerals
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soil with large grains that does not hold sand well
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sand
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