What are the two most abundant gases in the Earth's atmosphere?
A) Nitrogen and oxygen
B) Oxygen and carbon monoxide
C) Water vapor and argon
D) Methane and hydrogen
Correct Answer:
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Q15: The primary evidence for the existence of
Q16: What takes place at the earth's mid-oceanic
Q17: Which of the following can be accounted
Q18: Plate tectonic is believed to be caused
Q19: The layer of plastic,deformable rock just beneath
Q21: What is the primary reason that aurorae
Q22: The Earth's magnetopause is
A)The outer boundary of
Q23: What produces aurorae?
A)Chemical reactions in the upper
Q24: What is the primary cause of the
Q25: The Earth's mantle is in what state?
A)solid
B)liquid
C)gas
D)plasma
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