Water seeps into cracks and breaks apart the rock or water rubs the side of the rock that is exposed and breaks off pieces of the rock.
temperature of the water
Gravity influences a stream's ability to erode materials by pulling them downstream. The force of gravity helps water to carry sediment and erode the streambed. Additionally, gravity plays a role in the deposition of materials by causing sediment to settle out of the water when the stream's velocity decreases.
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Gravity pulls down the water, if there was no gravity the water would be floating in the air.
Streams erode their channels primarily through abrasion, the mechanical wearing away of rock and sediment. They also erode through the dissolution of soluble materials in the water, such as limestone. Finally, streams can erode their channels through hydraulic action, which is the force of moving water against the channel banks.
The slope of the river, its discharge, and the shape of the riverbed.the velocity of the water. the hardness of the mineral its trying to erode, the harder it is the longer it will take to erode.
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temperature (0_o)
by wind