Environmental Science
The gas that shows the most variation from place to place and from time to time in the lower atmosphere:

Water vapour (H2O)
Ozone (O3)
Methane (CH4)
Argon (Ar)
Carbon dioxide (CO2)

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Environmental Science
The atmosphere near the earth's surface is "heated from below." Which of the following does not significantly contribute to this heating?

Absorption of infrared energy that has been radiated from the surface
Conduction of heat upward from a hot surface
Convection from a hot surface
Heat energy from the earth's interior

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