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When a river flows, particles within the water wear away the sides of the river bank. This happens as they meander (when a river curves around corners) this causes water to push on the outer sides and push even more, wearing away in great curves.

They can, however, get wider by weakening the banks.

This however, depends on the circumstances, amount of rainfall, soil pH and other factors.

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Q: How does a river's bank become wider?
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