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Use the following words to complete the passage below - Erosion. Drainage basin. Decreases. Friction. Depth. Velocity. Tributaries. Stone size.

There are many changes that occur in rivers as a result of changes within the water cycle and .

increases as more water is added to rivers via tributary rivers. This means that less of the water is in contact with the bed of the river and the mouth so there is less energy used to overcome . Hence rivers flow progressively faster on their journey downstream.

Width and increases as more water is added from .

Gradient (the slope of the land) as rivers flow because the river meanders across the land rather than erode into it and follow a straight path as it does in the source. This means it covers a decrease in height over a longer distance the further downstream you get.

decreases downstream and the stones get rounder and smoother as rivers erode the rocks progressively as the stones are transported downstream. The processes of river operate here.