| A | B |
|---|
| weathering | occurs when natural forces break down rocks |
| mechanical weathering | breaking up of rocks by physical forces |
| exfoliation | when layers or sheets of rock gradually break off |
| abrasion | wearing something down by friction |
| chemical weathering | breaking up of rocks by chemical reactions |
| humus | decayed organic matter present in soil |
| soil horizon | a layer of soil with different properties than layers above or below |
| soil profile | the soil horizons in one location |
| desertification | the expansion of desert conditions in places where local plants have been destroyed |
| They can be separated into their components by using physical means. | What is true about mixtures? |
| chemically | When a substance dissolves it mixes completely with another substance without changing |
| hot, wet | Which climate type has conditions for the fastest chemical weathering? |
| cold, dry | Which climate type has conditions for the slowest chemical weathering? |
