Consult the figure below.During which period of Earth's history was the oxygen saturation in the atmosphere highest? 
A) Hadean Era
B) Cambrian Era
C) Carboniferous Era and Permian Era
D) Cenozoic Era
Correct Answer:
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Q9: As an air mass rises,it generally experiences
Q10: In the figure below,the pressure gradient is
Q11: Which two gases are most abundant within
Q12: Which two gases are most important in
Q13: Atmospheric convection of heat radiated from Earth's
Q14: In which layer in the figure below
Q16: To an observer traveling outward from Earth's
Q17: Which two gases are most abundantly emitted
Q18: The very first Earth atmosphere,forming with Earth
Q20: As air rises,why do clouds form?
A)raindrops converge
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