Where is water on earth located - Thomas County School ...

The Earth’s dry atmosphere is composed of: (volume %) 78 N2, 21 O2, 1 Ar, ~0.04 CO2. The average water vapor content is ~ 2% by weight. There are 108 cattle in the U.S.; each one emits CO2 at an average rate of 0.5 L/min. ................
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