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Anything in nature that is moving likes to keep going straight ahead at a constant speed. That is a paraphrase of Isaac newton's first law of motion. So when water flowing down a river comes to a turn, the water tries to keep going straight. The water eventually yields to the direction of the riverbed but not before doing some erosion to the river bank at the outer side of the turn. As the erosion continues over thousands of years, the river develops large, S-shaped meanders. A river's age can be roughly estimated by the quantity and size of its meanders.

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Q: When a stream bends or curves what begins to form?
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