How much carbon dioxide was present in Earth's atmosphere 4 billion years ago?
A) Much more than now
B) Much less than now
C) About the same amount as now
Correct Answer:
Verified
Q13: Where is most oxygen located?
A) Troposphere
B) Stratosphere
C)
Q14: What happens to the thermal gradient in
Q15: How thick is the atmosphere?
A) About 50
Q16: Which of these forms of solar radiation
Q17: How much does the greenhouse effect raise
Q19: Which change of state of water moves
Q20: Explain why temperature does not change when
Q21: Which process releases latent heat?
A) Evaporation
B) Melting
Q22: Where is air density the highest?
A) Mount
Q23: What is an adiabatic temperature change?
A) One
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