| A | B |
|---|
| mineral | material that forms in the earth from nonliving matter |
| fuel | a material that can be burned to produce useful heat |
| natural resource | a material that comes from the earth and can be used by living things |
| ore | rock that has a large amount of useful materials |
| decay | to slowly break down or rot |
| humus | decayed organisms in soil |
| nutrient | a material that plants and animals need to live and grow |
| clay soil | soil with tiny grains that are packed closely together |
| loam | good planting soil that is a mixture of clay, silt, sand, and humus |
| sandy soil | loose soil with large grains |
| recycle | to change somethings so it can be used again |
| landfill | a place where garbage is buried in soil |
| conserve | to keep something from being used up |
