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| A form of mechanical weathering that occurs when loose fragments or particles of rocks and minerals that are being transported, as by water or air, collide with each other or scrape the surfaces of stationary rocks. |
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| A triangular deposit of sediment left by a stream that has lost velocity upon entering a broad, relatively flat valley. |
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| The lowest level to which a stream can erode the channel through which it flows, generally equal to the prevailing global sea level |
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| The larger, heavier particles that are being transported by a stream. Instead of being dissolved or suspended, these are being rolled or bounced along, spending at least part of their time in contact with the stream bottom. |
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| A deposit of sediment that forms where a stream enters a standing body of water such as a lake or ocean. The name is derived from the Greek letter "delta" because these deposits typically have a triangular shape in map view. |
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| The volume of water in a flowing stream that passes a given location in a unit of time |
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| A ridge that separates two adjacent drainage basins |
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| The geographic area that contributes runoff to a stream |
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| An overflow of water onto lands that are normally above local water levels. |
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| An area of alluvium-covered, relatively level land along the banks of a stream that is covered with water when the stream leaves its channel during a time of high flow. |
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