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10 Cards in this Set
- Front
- Back
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bedrock |
the solid rock that is under the soil |
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humus |
the part of the soil made up of decayed parts of once living things |
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topsoil |
the top layer of soil made up of the smallest grains and the most humus |
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clay |
a type of soil made up of very small grains;it holds water very well |
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silt |
sand, clay, or other material carried by water and deposited as sediment |
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renewable resource |
a resource that can be replaced in a human life time |
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nonrenewable resource |
a resource that will be used up someday |
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soil |
the loose material in which plants can grow in the upper layer of Earth |
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loam |
a type of soil that is rich in minerals and has lots of humus |
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conservation |
saving resources by using them carefully |
