Earth's Atmosphere

> consider that the the pressure of the atmosphere is about 101 kPa ,760 mmHg, or 14.7lb/square inch

> if the atmosphere was compressed into a liquid state then given that pressure it would only be about 10 meters deep a very scarce resource easy to change in a short period of time
> gravity retains the atmosphere on Earth (the lighter gases such as H and He have already blown away1)
> composition is 79% nitrogen, 20% oxygen, and 1% other gases

> Mt. Everest peaks at the troposphere/stratosphere boundary , humans cannot consume enough O2 there although soaring birds are able
> atmosphere is responsible for circulating the elements O C N and H₂O globally
> it also protects life from many forms of radiation (UV) and medium sized asteroids

How CO2 water and calcium form rocks

H₂O (water) + CO₂ (carbon dioxide) = H₂ CO₃ (carbonic acid)

H₂ CO₃ = H⁺ (hydrogen ion)+ H CO₃^- (bicarbonate ion)

Ca⁺⁺ (calcium ion) + 2HCO₃^- = CaCO₃ (calcite) + HCO₃

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