| A | B |
|---|
| decomposer | organisms that break down remains of dead organisms |
| sod | thick mass of tough roots from grasses |
| natural resource | anything in the environment that humans use |
| dust bowl | long drought the soil becane dried out and blew east |
| soil conservation | management of soild to prevent its destruction |
| contour plowing | plow along the curves of the slope |
| conservation plowing | disturb the soil and plant cover as little as possible |
| crop rotation | plant different crops each year to absorb different nutrients |
