<span>Chad is 900 miles west of Khartoum Sudan.
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It cooled slowly, Australia is a very hot continent with high temperatures
You can use process of elimination here. The atmosphere is a key component for the air we breathe. The atmosphere protects us from harmful objects and rays. Finally, warm air has more moisture in it than cool air (for example why generally hot places are so humid).
The average depth is ~5 meters.
Mexico is a source of cheaper labor. Hope I helped.
