This occurs because of gravity. Water runs from the highest places (mountains and plateaus, or where rainfall occurs) to the lowest point, into the ocean.
Water flowing downhill across the surface of the Earth is called runoff.
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Runoff is the water flowing downhill across the surface of the Earth.
Water that flows over Earth's surface is called runoff. Runoff is an important agent of erosion, especially if the water is moving fast. The more speed water has, the more material it can carry with it.
If you are talking about land above sea , then it would be called run off, because when precipitation falls , whether it is rain or snow , at some point it usually makes its way from the land to the sea via flowing over the surface of the earth.
Water that doesn't sink in but runs across the Earth's surface is called surface water. This includes rivers, streams, creeks, and runoff from rain or snowmelt that flows over the ground.
Water which moves over the earths surface after having precipitated (rain, snow, etc) is known as runoff. Most rivers get the majority of their water from precipitation runoff.
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