The auroras in the upper atmosphere are caused by
A. the interaction of electromagnetic energy with atmospheric gases.
B. AM radio broadcasts.
C. various weather phenomena.
D. the interaction of the solar wind and atmospheric gases.
Answer:D
The auroras in the upper atmosphere are caused by
A. the interaction of electromagnetic energy with atmospheric gases. B. AM radio broadcasts. C. various weather phenomena. D. the interaction of the solar wind and atmospheric gases.