Why do astronomers think Earth ended up with so little CO2 compared with Mars and Venus?

A. Volcanoes on Earth outgassed less CO2 than on Venus and Mars.
B. Pollution on Earth has reduced the amount of CO2 originally present.
C. Plant life and abundant water have removed most of the CO2, locking it into rocks and the oceans.
D. Comets striking the surfaces of Venus and Mars added CO2 to their atmospheres, but not to Earth.


Answer: C

Physics & Space Science

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What would happen if you had a car made completely of plastic, with no metal parts, and you drove over a vehicle sensor embedded in the road surface?

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According to models of galaxy formation, which population of stars formed first?

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Which of the following correctly describes the meaning of albedo?

A) The lower the albedo, the more light the surface reflects, and the less it absorbs. B) The higher the albedo, the more light the surface reflects, and the less it absorbs. C) The higher the albedo, the more light the surface absorbs. D) The higher the albedo, the more light the surface emits. E) The higher the albedo, the more light the atmosphere absorbs.

Physics & Space Science