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
Convection from a hot surface
Heat energy from the earth's interior
Conduction of heat upward from a hot surface

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Environmental Science
Biogas is composed of

methane, carbon dioxide, nitrogen and sulphur
methane, carbon dioxide, nitrogen and hydrogen
carbon dioxide, nitrogen and hydrogen
ethane, carbon dioxide, nitrogen and hydrogen

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