Which of the following are true regarding ionosphere? 1. It is the upp – McqOptions

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1.	Which of the following are true regarding ionosphere? 1. It is the uppermost layer of atmosphere 2. The molecules and atoms of nitrogen and oxygen in this layer absorb a part of solar radiation and become ionized 3. This layer is responsible for reflecting back the radio wave~ transmitted from the earth
A.	I and II
B.	I and II
C.	II and III
D.	I, II and III
Answer» D. I, II and III

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