| A | B |
|---|
| mass movement | the downslope movement of loose sediments and weathered rock resulting from the force of gravity |
| creep | the slow, steady, downhill flow of loose, weathered Earth materials, especially soils |
| mudflow | swiftly moving mixtures of mud and water |
| landslide | a rapid, downslope movement of Earth materials that occurs when a relatively think block of loose soil, rock, and debris separates from the underlying bedrock |
| slump | when the mass of material in a landslide rotates and slides along a curved surface |
| avalanche | a landslide that occurs in mountainous areas with thick accumulations of snow |
| deflation | the lowering of the land surface that results from the wind's removal of surface particles |
| abrasion | when particles such as sand rub against the surface of rocks or other materials |
| ventifact | rocks that are shaped by wind-blown sediments |
| dune | a pile of wind-blown sand |
| loess | thick, wind-blown silt deposits |
| glacier | a large moving mass of ice |
| valley glacier | a glacier that forms in a valley located in high mountainous areas |
| continental glacier | a glacier that covers broad, continent-sized areas |
| cirque | a deep depression carved out by a glacier |
| moraine | a ridge that consists of till deposited by a glacier |
| outwash plain | an area at the leading edge of a glacier, where the meltwater streams flow and deposit outwash |
| drumlin | elongated landform created when glaciers move over older moraines |
| esker | long, winding ridges of layered sediments that are deposited by streams flowing under a melting glacier |
| runoff | water flowing downslope along Earth's surface |
| watershed | all of the land area whose water drains into a stream system |
| divide | a high land area that separates one watershed from another |
| solution | materials that are carried in a stream's water after it becomes dissolved |
| suspension | the way that all particles small enough to be held up by the turbulence of a stream's moving water are moved within a stream |
| bedload | consists of sand, pebbles, and cobbles that the stream's water can roll or push along the bed of the stream |
| discharge | the measure of the volume of stream water that flows over a particular location within a given period of time |
| flood | occurs when water spills over the sides of a stream's banks onto the adjacent land |
| floodplain | the broad, flat area that extends out from stream's bank and is covered by excess water during times of flooding |
| stream channel | a narrow pathway that moving water carves into the sediment or rock |
| stream bank | the ground bordering a stream on each side |
| meander | a bend or curve in a stream channel caused by moving water |
| delta | a triangular deposit that forms where a stream enters a large, quiet body of water |
| rejuvenation | when a stream actively resumes the process of downcutting toward its base level |
