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doit_the_clown doit_the_clown
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7 years ago
Auroras on the Earth are caused by
A)   reflection of sunlight from the Arctic and Antarctic ice into the polar skies.
B)   electrons accelerated by electric currents in the ionosphere and then deposited into the Earth's atmosphere.
C)   high-energy charged particles from the magnetosphere guided by the Earth's magnetic field into polar regions of the atmosphere.
D)   ultraviolet radiation from the Sun exciting and ionizing atoms in the Earth's upper atmosphere to emit characteristic colors of light.
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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discovererdiscoverer
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7 years ago
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