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Why does water ripple when a rock is thrown into it?

When you throw a stone or rock into water, you will notice that it creates ripples. When the rock hits the water, it moves downwards a lots of energy, and some of this energy moves outwards from the center. At the same time, the surface of water is pushed down a bit, but since the surface of the water has elastic quality, it comes back and moves outwards,  creating the ripples that we see.

These ripples are always in a circular pattern, whatever the shape of stone or rock may be. These ripples will continue as long as the center  continues to ‘bounce’. When the  water’s equilibrium is restored , the surface is still again, until the next rock, stone or pebble is thrown.    

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