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11 Cards in this Set
- Front
- Back
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soil |
loose weathered material on earth's surface in which plants grow |
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bedrock |
solid layer of rock beneath all soil |
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soil horizon |
layers of soil that differs in color and texture from the other layers above or below it |
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top soil |
dark brown soil that is a mixture of humus, clay, and other minerals |
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humus |
dark colored substance that forms as plant and animal remains decay |
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fossil fuels |
energy that rich substances form from the remains of organisms |
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renewable resource |
can be replaced in a useful time frame |
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nonrenewable resource |
can't be replaced in a useful time frame |
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hydroelectric |
electricity produced by flowing water |
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geothermal |
heat from the earth's interior |
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solar |
energy produced from the sun |
