| A | B |
|---|
| drainage system | Network of rills,gullies,streams and rivers,in a area. |
| drainage bazin | The total area drained all rivers in an area. |
| dunes | In desert area's and along shorelines,windblown sand is often deposited near rocks and bushs. |
| loess | Many layers of fine sand and silt form loess deposits which are very fertile. |
| running water | Is the majour cause of erosion.Streams and rivers carry clay,and send gravel downhill. |
| tributaries | Larger streams that flow into a river. |
| deflation | Is an erosion caused by the wind removing loose material such as clay,silt and sand from the land. |
| abbrasion | Is caused by the wind blown particles slowly wear away exposed rocks.The particles act like a sandblaster,cutting and polishing rocks. |
| mudflow | Usually occurs after a heavy rain.The rain mixes with the soil to form mud which slides downhill taking anything in its path including boulders and houses. |
| slump | Slump happens when a block of rock or soil on the face of a steep slope slips down so that its upper surface is tilted backwards as it moves. |
| mass wasting | The downhill movement of sediments caused by gravity. |
| gravity | Pulls rocks down slopes. |
| organic activity | Plants and animals can cause mechanical weathering.The roots of plants sometimes loosen rock material.This is called root pry. |
| frost action | The repeated freezing and melting of water is a common cause of mechanical weathering. |
| gravity | Sometimes gavity pulls loosened rocks down mountain cliffs in a landslide. |
| Abrasion | Wind blown sand causes mechanical weathering of rocks by abrasion.Abrasion is the wearing away of rocks by solid particles carried by wind,water or other forces. |
