World Geography
The most important force that provide resistance to particles towards entertainment is

frictional resistance
particle cohesive bonds
particle adhesive bonds
momentum

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World Geography
The Harmattan is

tertiary wind that carry great quantities of fine dust from the Sahara
cool, extremely dry wind that forms over the Sahara and blows westward or south-westward to the Af
All of these
wind that blows during the dry season from December to February

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