Oxygen (O2) is being added to the atmosphere by ________.
A) solar radiation
B) animal decomposition
C) meteorites
D) vegetation
E) the burning of coal
Correct Answer:
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Q1: _ is (are) responsible for placing oxygen
Q2: The concentration of carbon dioxide in the
Q4: Nitrogen is the _ component of the
Q5: Which of the following is NOT a
Q6: The third most plentiful gas in the
Q7: Over warm oceans, water vapor comprises about
Q8: Water vapor is nearly absent _.
A) in
Q9: By volume, which of the following comprises
Q10: The normal percent of water vapor in
Q11: About 10,000 kilometers above the surface is
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