What are the abundant elements that make up the composition of Earth's present-day atmosphere?
A) oxygen and carbon dioxide
B) nitrogen and oxygen
C) carbon dioxide, nitrogen, and hydrogen
D) hydrogen and oxygen
Correct Answer:
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Q3: The ocean originated from .
A) water vapor
Q4: The world ocean .
A) plays a minor
Q5: When using the scientific method, scientific theories
Q6: About % of Earth's water is found
Q7: Volcanic venting of substances including water vapor
Q9: On a planetary scale, the ocean comprises
Q10: S cientists believe that answers to questions
Q11: New planets formed in a cloud of
Q12: Which statement is most consistent with the
Q13: The death of a star is characterized
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