The most active sculptors along the coast are the waves. They are energized and ready to work when they break on the shore after being built up by winds far out at sea.
Swash, or the upward surge of water, brings results.
Correct answer is: swell
When waves go from one medium to another, their direction might alter. This is called refraction of waves. Refraction, or the bending of the wave's path, causes a change in the wave's speed and wavelength.
The main factor causing erosion along the coast is waves. By eroding rock and shifting sand and other debris, waves sculpt the coastline.
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