The Earth's atmosphere is rich in _____, a product of plant photosynthesis.
A) oxygen
B) nitrogen
C) argon
D) carbon dioxide
E) carbon monoxide
Correct Answer:
Verified
Q21: From the small number of impact craters
Q22: The four planets nearest the sun are
Q23: _ is the closest moon to Jupiter
Q24: Our galaxy is called the _.
A) Oort
Q25: Perhaps the most obvious of _ surface
Q27: To measure vast distances in the solar
Q28: Heat left over from this planetary formation
Q29: The sun, its eight planets and their
Q30: To the best of our knowledge, the
Q31: Astronomers estimate that our galaxy contains _
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