1.

Which of the following are true regarding ionosphere?I. It is the uppermost layer of atmosphereII. The molecules and atoms of nitrogen and oxygen in this layer absorb a part of solar radiation and become ionizedIII. This layer is responsible for reflecting back the radio wave transmitted from the earth

A. and II
B. and II
C. I and III
D. , II and III
Answer» D. , II and III


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