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Fades into outer space, no clear upper boundary, not all scientists agree that it is part of atmosphere.

The phrases above are describing what layer of our atmosphere?

A: actinosphere
B: exosphere
C: thermosphere
D: ionosphere

1 Answer

4 votes

Answer: b

Step-by-step explanation:

The Exosphere is the uppermost region of the Earth's atmosphere and has no clear upper boundary since it gradually fades into outer space. The exosphere is the uppermost region of Earth's atmosphere as it gradually fades into the vacuum of space.

User Oliver Nybroe
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