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Unit 4
Weathering, Erosion, Deposition, and Landforms
Term | Definition |
---|---|
Weathering | The breakdown of rock material into smaller pieces, by a physical or chemical process. |
Physical Weathering | The process by which rock is broken down by physical changes such as temperature changes, pressure changes, plant and animal actions, water, wind, and gravity. |
Abrasion | The breaking down or wearing away of rock material by the mechanical action of other rock. Three agents (causes) of this are water, wind, and gravity. |
Chemical weathering | The breakdown of rocks by chemical reactions. Agents include oxygen and acids. |
Oxidation | The process by which other chemical compounds in a rock combine and react with oxygen. |
Acid Precipitation | Chemicals that are formed when fossil fuels are burned combine with with water in the atmosphere; this mixture then falls to earth. |
Erosion | The process by which sediment is moved from one place to another. Water, wind, ice, and gravity can cause this. |
Sediment | Tiny grains of broken-down rock |
Deposition | The process by which eroded sediment is dropped or set down. This occurs when gravity's downward pull on a sediment is greater than the push of flowing water or wind. |
Canyon | A deep channel cut into a landscape over time by erosion from a stream or river. |
Floodplain | A flat area formed by many layers of deposited sediment. |
Delta | A fan-shaped pattern formed when a stream deposits its load of sediment. |
Sea Cliff | This landform is created when waves erode rocks to form steep slopes. |
Wave-cut platform | A sea cliff that has been eroded down to the waterline to form an underwater "bench" |
Headland | A finger-shaped projection formed from eroded sea cliffs. |
Meander | A curve or bend in a stream. Erosion occurs on the outer bank, deposition occurs on the inner bank. |
Oxbow Lake | A crescent- or horseshoe-shaped lake that forms from a cut-off meander. |
Beach | An area of shoreline made up of sediment deposited by waves and currents. |
Sandbar | An underwater ridge of sand, gravel, or shell material. |
Barrier island | A long, narrow island usually made of sand, that forms parallel to the shoreline. |
Dune | Mounds of wind-deposited sand |
Loess | Thick deposits of windblown, fine-grained sediment. |
Glacier | A large mass of moving ice that forms by the compacting of snow. |
Glacial drift | All materials or sediment carried and deposited by a glacier. |
Creep | The extremely slow movement of material or sediment down a slope. |
Rockfall | Loose rocks fall down a steep slope. |
Landslide | The sudden and rapid movement of a lot of material down a slope. |
Mudflow | The rapid movement of a large amount of mud that forms when a large amount of water mixes with soil and rocks. |
Coastline | An ever-changing boundary between land and ocean. |