Erosion is the process in which water, wind, gravity or ice moves fragments of soil and rock.
Gravity
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Flowing streams pick up and transport weathered materials by eroding sediments from their banks. The sediment is carried through the following loads: dissolved, suspended, and bed.
Dissolved: A load composed of ions in solution. Typically these ions make it all the way to the ocean.
Suspended: Solid sediments carried in the stream as it flows. Faster moving streams can carry larger particles.
Bed: Particles that are too large to be carried in a suspended load are bumped and pushed along the stream bed. These sediments move intermittently in a movement called saltation.
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Waves are essential for building up and breaking down shorelines. As waves approach the shore, the wave refraction can either concentrate or disperse the wave energy. If dispersed, it creates a sand deposit; if concentrated, erosion occurs.
Refraction: Waves approaching the shore slow down when it "feels" the bottom in shallow water. This causes the waves to bend and more directly face the shore.
It's the combination of strong, steady winds, blowing over a long period and distance, that creates powerful wave energy. It's this wave energy that is responsible for the erosion at the shore.