alleryWhich layer is the outermost and is mainly hydrogen and helium?
AExosphere
BIonosphere
CStratosphere
DMesosphere
Answer & Solution
Correct answer: A. Exosphere
1. Layers are counted from the ground up.
2. The exosphere is the outermost layer.
3. It is composed mainly of hydrogen and helium.
_Source: Wikipedia, Natural environment, Principal layers_
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