| A | B |
|---|
| abrasion | Weathering in which rock is worn away by the grinding action of other rock |
| litter | A layer of dead plant material, such as leaves and stems, that forms on the surface of the soil. |
| A horizon | Layer of soil where topsoil is found |
| humus | Decayed organic material in soil |
| soil conservation | The management of soil to prevent its destruction |
| mechanical weathering | May result from the growth of plant roots and animal activity |
| Dust Bowl | Resulted from a drought and poor soil management in the 1930's |
| bedrock | Solid layer of rock beneath the soil |
| soil | Mixture of rock particles, minerals, decayed organic material, air, and water |
| rock type and climate | Factors that determine rate of weathering |
| hot and wet | Climate that causes rapid weathering |
| gravel | One of the largest particle found in soil |
| erosion | Can cause the loss of unprotected soil |
| soil formation | Begins with the weathering of rock |
| decomposers | Soil organisims that break and digest the remains of dead organisms |
| Horizon A | Soil horizon that forms last |
| Chemical weathering | Weathering that causes MINERAL composition of rock to CHANGE |
| SOIL as a valuable resource | is important to all living things |
| Erosion by water/wind | Causes loss of soil not protected by plant cover |
| Plant roots & Animal action | Teo types of mechanical weathering |
| Permeable Rock | Contains small connected airspaces |
| Marble statue weathers away | Due to carbonic acid in rainwater |
| Living organisms in soil help by.. | Mixing the soil and making humus |
| B Horizon | Subsoil |
| C Horizon | Partially weathered rock |
