| | Stream - Iridis Encyclopedia (Site not responding. Last check: 2007-10-14) |
 | | When a stream flows over an especially resistant stratum and forms a waterfall or cascade, or the same results because for some reason the base level of erosion suddenly drops, perhaps as a result of a fault, the resulting sudden change in stream elevation is called a nickpoint. |
 | | However, if some resistant material slows or stops the downstream movement of a meander, a stream may erode through the neck between two legs of a meander to become temporarily straighter, leaving behind an arc-shaped body of water termed an oxbow lake or bayou. |
 | | When a stream emerges from an underground course, it is termed a spring. |
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