Deserts are formed by weathering processes as large variations in temperature between day and night put strains on the rocks which consequently break in pieces. Although rain seldom occurs in deserts, there are occasional downpours that can result in flash floods.
Rift valley is a region which is lower than normal land area. This is formed by the interaction of the earth's tectonic plates. This linear shaped land is found between mountain ranges created by geologic rift.
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