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Water, tending to flow in a straight line until something forces it to change direction, impacts the outside bend of a meander much more strongly than anywhere else. The outer banks have to turn the water flow, and in doing so they take the brunt of the water's impact.

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15y ago
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14y ago

I hope someone can elaborate on this question... It is due to the same principle as a whip effect used when many people lock arms on an ice skating rink or on roller skate and all turn together. the outside person travels really fast while the inside person is traveling very slow.

Also, you can think it as a car turning. When it turns left, the wheels at the left rotate less than those at the right. Similarly, for rivers, it works the same way. If the two sides have equal speed, it would create a straight river.

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14y ago

This is due to a larger amount of friction at the edges of a river. the U shaped ditch it sits in provides many obstacles, and due to hydrogen bonding this friction extends over more than just the immediate layer of water in contact with earth. The surface of the river is subject to an air drag force and so the middle of the river is the only free flowing spot with least resistance.

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8y ago

Rivers erode more on the outside of a meander because the current is faster than on the inside of the curve.

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Q: Why do rivers flow fastest around the outside of a meander?
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