Which of the following gases was NOT part of Earth's original atmosphere?
A) water vapor
B) carbon dioxide
C) nitrogen
D) oxygen
E) both A and C
Correct Answer:
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Q9: The age of Earth is about _.
A)
Q12: Which one of the following does NOT
Q13: Which era of geologic time spans about
Q14: As they formed,due to their high temperatures
Q15: The beginning of the Cambrian period marks
Q17: The most common Precambrian fossils are _,
Q19: The major source of free oxygen in
Q19: The Precambrian rock record indicates that much
Q41: Which type of bacteria thrive in environments
Q42: During the early Paleozoic era,South America,Africa,Australia,Antarctica,India,and perhaps
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