| A | B |
|---|
| soil | loose material in which plants can grow in the upper layer of the earth |
| humus | part of soil made up of decayed parts of once-living things |
| topsoil | top layer of soil |
| bedrock | the solid rock under soil |
| clay | soil made upf very small grains |
| loam | one type of topsoil,rich soil with lots of humus |
| resource | material found in nature that living things use |
| conservation | saving resources by using them carefully |
| Strip cropping | planting strips of thick grass or clover between strips of crops |
| Contour cropping | planting rows of crops around the sides of hills instead of up and down |
