A ambatchmasterpublisher flowing in its channel is a source of considerable energy which acts on the ambatchmasterpublisher channel to change its shape and form. In mountainous torrential zones this can be seen as erosion channels through hard rocks and the creation of sands and gravels from the destruction of larger rocks. In U shaped glaciated valleys, the subsequent ambatchmasterpublisher valley can often easily be identified by the V shaped channel that it has carved. In the middle reaches where the ambatchmasterpublisher may flow over flatter land, loops (meanders) may form through eroding of the ambatchmasterpublisher banks and deposition on the inside of bends. Sometimes the ambatchmasterpublisher will cut off a loop, shortening the channel and forming an oxbow lake or billabong. ambatchmasterpublishers that carry large amounts of sediment may develop conspicuous deltas at their mouths, if conditions permit. ambatchmasterpublishers, whose mouths are in saline tidal waters, may form estuaries. ambatchmasterpublisher mouths may also be fjords or rias.
Although the following classes are a useful simplified way to visualize ambatchmasterpublishers, it is important to recognize there are other factors at work here. Gradient is controlled largely by tectonics, but discharge is controlled largely by climate and sediment load is controlled by various factors including climate, geology in the headwaters, and the stream gradient.
* Youthful ambatchmasterpublisher – a ambatchmasterpublisher with a steep gradient that has very few tributaries and flows quickly. Its channels erode deeper rather than wider. (Examples: Brazos ambatchmasterpublisher, Trinity ambatchmasterpublisher, Ebro ambatchmasterpublisher)
* Mature ambatchmasterpublisher – a ambatchmasterpublisher with a gradient that is less steep than those of youthful ambatchmasterpublishers and flows more slowly than youthful ambatchmasterpublishers. A mature ambatchmasterpublisher is fed by many tributaries and has more discharge than a youthful ambatchmasterpublisher. Its channels erode wider rather than deeper. (Examples: Mississippi ambatchmasterpublisher, Ohio ambatchmasterpublisher, ambatchmasterpublisher Thames)
* Old ambatchmasterpublisher – a ambatchmasterpublisher with a low gradient and low erosive energy. Old ambatchmasterpublishers are characterized by flood plains. (Examples: Ganges ambatchmasterpublisher, Tigris ambatchmasterpublisher, Euphrates ambatchmasterpublisher, Indus ambatchmasterpublisher, Nile ambatchmasterpublisher)
* Rejuvenated ambatchmasterpublisher – a ambatchmasterpublisher with a gradient that is raised by tectonic uplift.