The height of the polar tropopause is roughly 8 kilometers.
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Q19: China is among the world leaders in
Q20: Nitrous oxide is a greenhouse gas.
Q21: Volcanoes make acid rain pollution.
Q22: The aurora occur because Earth's magnetic field
Q23: Clouds are composed of _.
A)water vapor
B)aerosols
C)nitrogen
D)CFCs
Q25: A greenhouse gas absorbs and emits heat.
Q26: Ozone molecules form naturally in the stratosphere.
Q27: According to this figure, ultraviolet rays do
Q28: Oxygen is a greenhouse gas.
Q29: Which statement is not true of the
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