| A | B |
|---|
| weathering | breaking down of rocks and other materials on the earths surface |
| mechanical weathering | larger rocks are broken into smaller peices without changing the chemical makeup |
| chemical weathering | when the chemical makeup of the rock is changed |
| temperature | a rock heats up and cools down, it expands and contracts over time this causes particels of the rock to crack or flake off |
| exfoliation | when a rock cracks of flackes off |
| frost action | water gets into the cracks of rocks the water freezes and it expands which causes the rock to break |
| root pry | plants or roots growing in the cracks in rocks can make the cracks larger and evenatually cause the rock to break |
| gravity | pulls loosened rocks down a cliff as they fall they collide with one another and break into smaller peices |
| lanfslides | loosened rocks falling down a mountain cliff |
| abrasion | the particles of sand scrape off peices of exposed rocks |
| plant acid | plants produce a weak substance which can disolve certain minerals |
| erosion | rock and soil are moved from one place to another |
| deposition | sediments are laid down in a new location |
| mud flow | a substance that slides down a hill taking anything in it's path |
| wind | the most active agent of erosion in desserts, plowed feilds, and beaches |
| deflation | wind removing loose materials such as clay, silt, and sand from the land |
| dunes | wind blown sand deposited near rocks and bushes wind blowing over these is blowed down and more sand is deposited |
| wind breake | fences or rown of trees help to slow down the wind and reduce erosion caused by wind |
| running water | major cause of erosion |
| drainage system | a network of rills, gullies, streams, and rivers in an area |
| glaciers | a large mass of moving ice and snow |
| waves | erode and shape the shoreline and break off small peices of rock |
| sea stack | columns of resistant rock left standing when all that was around in eroded away |
| sea cave | hollowed out portion of a sea cliff |
| beaches | eraded rock particles that build up in one location |
