Which factors directly affect the climatic conditions of any particular area? distance from the equator
year of origin of the cities in the area
shape and height of the continental land mass
agricultural yield of the area

distance from the equator and shape and height of the continental land mass

Explanation:

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i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.