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| the layer of bits of rocks and humus found on the Earth's crust. |
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| the decayed remains of dead plants and animals |
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| a type of soil with very small grains and small spaces between them |
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Definition
| rich soil with lots of humus |
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Definition
| a material found in nature that living things use. |
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| saving resources by using them carefully |
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| planting strips of different crops next to each other |
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| planing rows of crops around hills instead of up and down their sides. |
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