Answer:
It is thicker below mountains than in valleys.
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The equator
Because Earth is a sphere, not all part of the Earth receives the same amount of solar radiation. More solar radiation is received and absorbed near the equator than at the poles. Near the equator, the Sun's rays strike the Earth most directly, while at the poles the rays strike at a steep angle.
C is not a challenge faced by aid organizations
The first step of the scientific method is to pose a question or problem to be investigated.
D. (English) is a German language.
A. B. & C. are Latin Language