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I'm not sure if this is a chemistry or physics question so I'll try it here & see what happens.
When I drop a stone into water, the stone goes through the surface of the water. OK, there may be a few splashes due to the water "rebounding" (I don't know the technical term), but the stone doesn't bounce.However, when I pour water over a stone, it doesn't just flow over the stone, it bounces & splashes all over the place.
So why is the outcome apparently different when dropping a stone into water or pouring water over a stone?