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ch. 3 lesson 1-3 8th
| Question | Answer |
|---|---|
| erosion | The process by which water, ice, wind, or gravity moves weathered particles of rock and soil. |
| sediment | Small, solid pieces of material that comes from rock or the remains of organisms; Earth materials deposited by erosion. |
| deposition | An organism that gets energy by breaking down wastes and dead organism, and return raw materials to the soil and water. |
| gravity | The attractive force between objects; the force that moves objects downhill. |
| mass movement | Any one of several processes by which gravity moves sediment downhill. |
| runoff | Water that flows over the ground surface rather that soaking into the ground. |
| Rill | A tiny groove in soil made by flowing water. |
| gully | A large channel in soil that carries runoff after a rainstorm. |
| stream | A channel through which water in continually flowing downhill. |
| tributary | A stream or river that flows into a large river. |
| flood plain | The flat, wide area of land along a river. |
| meander | A loop like bend in the course of a river. |
| oxbow lake | A meander cut off from a river. |
| delta | A landform made of sediment that is deposited where a river flows into an ocean or lake. |
| alluvial fan | A wide, sloping deposit of sediment formed where a stream leaves a mountainrange. |
| groundwater | water that fills the cracks and spaces in underground and rock layers. |
| stalactite | An icicle-like structure that hangs from the ceiling of a cavern. |
| stalagmite | A column like from that grows upward from the floor of a cavern. |
| karst topography | A region in which a layer of limestone close to the surface creates deep valleys, caverns, and sinkholes. |
| glacier | Any large mass of ice that moves slowly over land. |
| continental glacier | A glacier that covers much of a continent or large island. |
| ice age | Time in Earth's history during which glaciers covered large parts of the surface. |
| valley glacier | A long, narrow glacier that forms when snow and ice builds up in a mountain valley. |
| plucking | The process by which a glaciers picks up rocks as it flows over the land. |
| till | The sediment deposited directly by a glacier. |
| moraine | A ridge by the till deposited at the edge of a glacier. |
| kettle | A small depression that forms when a chunk of ice is left in glacial till. |