Discussion
The turbidity currents observed in arid climate are better known as ................... .
Answer: A
The key gives Dust storms.
A turbidity current is a density current: a flow made heavier than its surroundings by the sediment it carries in suspension, which then moves along the ground under gravity. In arid regions the atmospheric counterpart is the dust storm, such as the haboob of the Sudan, where a mass of cold, dust-laden air advances along the ground as a dense wall, so dust storms are the arid form of such currents.
A thunderstorm is a convective cloud system, a tornado a narrow rotating vortex and a cyclone a large low-pressure system. None of them is defined by a load of suspended sediment moving as a density current.
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