In arid climates, the main source of erosion is wind.[97] The general wind circulation moves small particulates such as dust across wide oceans thousands of kilometers downwind of their point of origin,[98] which is known as deflation. Westerly winds in the mid-latitudes of the planet drive the movement of ocean currents from west to east across the world's oceans. Wind has a very important role in aiding plants and other immobile organisms in dispersal of seeds, spores, pollen, etc. Although wind is not the primary form of seed dispersal in plants, it provides dispersal for a large percentage of the biomass of land plants.
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