Describe the differences in density, how they appear, and what effect has on the the climate of the globe.

Explanation:

Since urban areas feature high concentrations of people, they are also more deadly during natural disasters. If climate change leads to more frequent and intense storms and floods, high-density population centers will be among the most exposed.

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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.