Question:

HElP PLZZ... EMERGENCY?

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can sombody please help me answer these questions for earth science... please im close to failing.

1.what makes up from 0 to 4 percent of the atmoshpere?

2.what contains 75 percent of the atmospheric gases?

3.cold air is denser than warm air and therefore has higher_______

4.what is the only substance that exists as a solid,liquid,and a gas in earths atmosphere?

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  1. 1.  I'm not sure

    2.  Nitrogen

    3.  Density

    4.  Water


  2. 1. Various trace gases

    2. Troposphere

    3. Refractive index

    4. Water
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