The __________ is a mixture of gases, mostly nitrogen and oxygen.
Correct Answer:
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Q5: The atmosphere consists mainly of _.
A) nitrogen
Q6: The rigid, outer part of Earth, including
Q7: Water frozen in glaciers is part of
Q8: Liquid freshwater amounts to about _ percent
Q9: The central portion of the Earth, called
Q11: During the formation of planets, gravitational forces
Q12: The _ contains all of Earth's water.
Q13: Earth's core consists mostly of _.
A) iron
Q14: _ is a principle stating that the
Q15: The increased carbon dioxide level has raised
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