How does the continental divide affect the climate

The higher up north you are, the colder and more dry it is. The farther down south you are, the colder and  rainy is it. in the center its very hot and can either be dry or wet.

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.

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