What causes the wind?
a) the earth's orbit around the sun
b) the earth's rotation on its axis.
c) the layers of the earth's atmosphere.
d) uneven heating of the earth's surface by the sun.

C

Explanation:

Wind is caused when the molecules in the atmosphere go from areas of high concentration to areas of low concentration

I'm not sure exactly but i think it's this one

answerpeople organize large projects such as levee-building;

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