| A | B |
|---|
| acid rain | a mild acid solution formed when rain mixes with sulfur dioxide and nitrogen oxides in the air. Contributes to the chemical weathering of certain kinds of rocks and minerals |
| alluvial fan | a triangular-shaped landform created when deep, fast-moving water enters a wide, shallow area, slows down, and deposits its sediment. Similar to a delta, but forms upstream |
| base level | the level at which a stream or river enters a lake or ocean. The mouth of a stream or river is at its base level |
| breakwater | an artificial barrier constructed along the shoreline to absorb or deflect the energy of waves, thereby reducing erosion |
| chemical weathering | the process of breaking down the earth's surface by changing the chemical composition of rocks and minerals (for example, by acid rain or oxidation) |
| delta | a landform created when a river or stream reaches its base level, slows down, and deposits its sediment, names after the Greek letter delta from its shape |
| deposition | the process in which particles settle to the bottom of a liquid; in this case, the release of sediment that occurs when a fast-moving river or stream slows down |
| dike | a barrier of earth erected to keep a river or stream from overflowing its banks |
| dune | a mound of wind-blown sand resulting from the constant erosion and deposition of sand by wind |
