What prevents much of the Sun's energy from reaching Earth's surface?

What does all the water on Earth form?

What do we call the mixture of gases that surrounds the planet?

What percentage of clean dry air is carbon dioxide?

Which atmospheric gas varies from 0 to 4 percent?

Which greenhouse gas is not a normal part of the atmosphere?

Which greenhouse gas is produced naturally by respiraton and volcanic outgassing?

Which greenhouse gas is naturally produced by atmospheric processes?

Which human activity contributes most to increasing carbon dioxide levels?

How have humans affected the level of CFC's?

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