Erosion by water. How does it happen?
Erosion by water happens when the water from a fast current wears away the rocks and possibly, transport them down-stream to the sea. The water moves at such a fast speed, sometimes it might dislodge a piece of root and a whole avalanche of rocks can fall into the current and deposit them somewhere else. The rocks may get stuck on the side of the river banks along with sediment. This type of erosion can also be found near seaside cliffs. The wave generates so much force that it smashes into the cliff face and pieces of rocks get broken off. After a period of time, it can form an arch, cave, or even make stumps. The rates of which the rocks erode depend on how hard it is, the acidic content of the water, climate shange and the weather. If the rocks are hard, the chances are that it would erode slower than soft rock, which erodes quicker. The acidic content of the water determines if the acid will react with certain types of rocks and possibly, make the process of erosion quicker. Climate change has a very important role in this type of erosion. The fact that the ice from the North Pole is melting means that there is aa larger volume of water, and the larger the volume of water, the more powerful the waves are. Storms can also help erode the rocks as it generates wind which pushes the waves at the rock at a greater speed. The wind may also contribute to the erosion solely by itself.
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Information taken from
http://education.nationalgeographic.com/education/encyclopedia/erosion/?ar_a=1
http://education.nationalgeographic.com/education/encyclopedia/erosion/?ar_a=1