What is lateral erosion?

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What is vertical erosion?

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Why do discharge and velocity increase downstream?

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In the middle course of the river valley floor becomes wider why is this?

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Why does the river channel become wider and deeper with distance downstream?

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Why is the cross profile of a river valley narrow and steep sided in the upper course?

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Why does the long profile of a river become concave in the middle course?

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Where is the steepest gradient in the long profile of a river?

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What is the long profile of the river?

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