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ECS chpt 3.1 & 3.2
Erosion and Deposition
Term | Definition |
---|---|
mass movement | The process of moving sediment downhill. ex: landslides, mudflow, slump, creep |
sediment | The material moved by erosion |
deposition | The process by which sediment is "laid down" or deposited on Earth's surface. |
erosion | The process by which sediment is moved or carried from one place to another. |
rill | Tiny grooves made from flowing water; often caused by runoff created by rainfall. |
gully | A larger groove made by joining rills; water dries up after rainfall stops. |
runoff | Water that flows over Earth's surface when rainfall is too fast and sudden to be soaked up or evaporated. |
stream | A small channel where water is continuously flowing; it doesn't dry up after rainfall stops. |
tributary | A stream or river that flows into a larger stream or river. |
drainage basin | The area of land from which a river gets its water. Also called a watershed (Upstream) |
river | A large stream |
divide | The high ground between two drainage basins |
flood plain | A wide valley where a river flows; this area floods during heavy rainfall. |
meander | a loop-like bend in the course of a river |
oxbow lake | A meander that has been cut off from the river |
alluvial fan | Wide sloping deposit of sediment formed where a stream leaves a steep mountain range; fan-shaped |
delta | A landform formed when sediment is deposited at the mouth of a river. |
groundwater | Underground water; soaked into the ground and fills cracks in layers of rock below the surface. |