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The upper course of the river what sort of valley?

What is it called then boulders and rocks are dragged or rolled along the river bed?

The speed of the river is the...

Which 'load' is bounced along the river bed?

When a river erodes from side to side, weaving, it .....?

When rivers leave material behind it is called?

Mounds of embankments left that are higher than the floodplain are called?