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09 Earths Changing S
Earths Changing Surface
| Question | Answer |
|---|---|
| shoreline | the boundary between land and a body of water. |
| surf | a group of waves that break as they reach the shoreline. |
| beach | any area of the shoreline made up of material deposited by waves. |
| longshore | current a water current that moves the sand in a zigzag pattern along the beach. |
| sandbar | an underwater or exposed ridge of sand, gravel, or shell material found in open water. |
| barrier spit | an exposed sandbar found in open water that is connected to the shoreline. |
| saltation | the movement of sand or other sediments by short jumps and bounces caused by the wind or water. |
| deflation | a form of wind erosion in which fine, dry soil particles are blown away. |
| loess | very fine sediments deposited by the wind. |
| dunes | a mound of wind‐deposited sand that keeps its shape even though it moves. |
| slip face | the steeply sloped side of a dune. |
| glacier | a large mass of moving ice. |
| glacial drift | the rock material carried and deposited by glaciers. |
| till | unsorted rock material that is deposited directly by a melting glacier. |
| moraines | the most common type of till that form ridges along the edges of glaciers. |
| stratified drift | a glacial deposit that has been sorted and layered by the action of streams or meltwater. |
| mass movement | the movement of any earth material such as rock, soil, mud, or snow down a slope. |
| rock fall | a group of loose rocks that fall down a slope. |
| landslide | the sudden movement of rock and soil down a slope. |
| mudflow | the flow of a mass of mud or rock and soil mixed with a large amount of water down a slope. |
| lahars | a mudflow caused by heavy rains mixed with volcanic ash. |
| creep | the slow downhill movement of weathered rock material. |