| A | B |
|---|
| mechanical | rocks broken apart by physical process |
| chemical | reactions dissolve minerals in rocks |
| ice wedging | water enters cracks in rock and freeze |
| horizon | layer of soil |
| no-till | leaving stalks in field in winter |
| oxidation | rusting |
| profile | all horizon of soil form this |
| leaching | dissolved minerals moved to B horizon |
| weathering | surface process that work to break down rock |
| carbonic acid | water mixes with CO2 |
| warm, humid climate | where chemical weathering occurs fastest |
| cold climate | where mechanical weathering occurs fastest |
| horizon A | most humus and smallest rock and minerals |
| horizon B | larger rock, more minerals, and lighter color |
| overgrazed | livestock eat all grass on land |
| humus | organic material in soil |
| dependent variable | measured in experiment |
| independent variable | experimental variable controled |
| constant | doesn't change in an experiment |
| control | compared to in an experiment |
| terracing | level topped areas on hills |
| horizon C | has large parent rocks |
| contour farming | planting along contours of land |
| litter | leaves and organic material; changes into humus |
