In the upper course the dominant activity of a river is:

1. Valley
2. Meander
3. Erosion
4. Mass wasting

In the middle course of a river the gradient is gentle so the flow of the river slows down such that it appears like a snake over its floodplains forming which of the following?

1. Deltas
2. Gorges
3. Meanders
4. Rapids

Stationary, long and narrow sand-ridges which grow parallel to the direction of the prevailing wind and remain in a fixed position.

1. Dunes
2. Sand Dunes
3. Barchan
4. Seifs

The lowering of land, rounding of exposed rock surfaces and levelling of the peaks:

1. Denudation
2. Erosion
3. Mass wasting
4. Deposition