Answers

2015-12-03T19:19:34+05:30
Because the water exerts more pressure at down that is where it is situated than when the waves rise up on.
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2015-12-03T19:23:44+05:30
Because water exerts more pressure in the depth(at the bottom) than the height of the dam so the walls are made stronger and thicker at the bottom of dams
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Because the pressure of water is so high on bottom comparison to top so this by the bottom wall of dam is thick and strong