The Colorado river cut the grand canyon because The Mississippi moves slower. The Mississippi has a lower change in elevation each mile, on average.
- A deep valley with steep sides is called a canyon. Spanish for "tube" or "pipe," "canyon" is derived from the word caon. Although the words "gorge" and "canyon" are frequently used interchangeably, a gorge is almost always narrower and steeper than a canyon.
- Canyons are produced by tectonic activity, weathering and erosion, and river movement.
- River canyons are probably the most well-known kind of canyon. River beds can be severely damaged by the pressure of the flowing water. A deep, narrow channel is formed when riverbed sediments are carried downstream.
- Entrenched rivers are those that flow through large, deep canyons. They are firmly established because, unlike rivers in broad, flat flood plains, they do not meander or diverge.
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