Auroras on Earth Are Caused by

question 297

Multiple Choice

Auroras on 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 Earth's atmosphere.
• C) high-energy charged particles from the magnetosphere guided by Earth's magnetic field into polar regions of the atmosphere.
• D) ultraviolet radiation from the Sun exciting and ionizing atoms in Earth's upper atmosphere to emit characteristic colors of light.

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