| A | B |
|---|
| chemical weathering | the breaking up of rocks due to a change in chemical composition and occurs when water, air and other substances react with the minerals in rock |
| desertification | the formation of a desert when livestock overgraze an area that receives little rain |
| horizon | a soil layer, most areas have 3 |
| humus | dark colored organic matter made of decaying plants and animals |
| ice wedging | the breaking of rocks when water in cracks freezes and expands |
| leaching | when minerals are dissolved in water and carried down through a soil profile |
| mechanical weathering | the breaking up of rocks without changing their chemical composition |
| oxidation | chemical weathering that occurs when a substance is exposed to oxygen and water |
| soil | a mixture of weathered rock and decaying organic matter |
| soil profile | a vertical section of soil layers |
| weathering | the breaking of rocks into smaller pieces either mechanically or chemically |
