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Deep-Sea Animals

Air Pressure

Atmospheric Pressure

Why are we not crushed by the air pressure?

Atmospheric pressure: measurement of the force of air molecules per unit of area in the atmosphere at a given altitude.

Properties of Gases

Comparing Atmospheres

Where does all the nitrogen come from?

Why is Earth's atmosphere so much different?

What gases make up the atmosphere?

Nitrogen ~ 79%

Oxygen ~ 21%

Argon ~ 0.93%

CO ~ 0.04%

What evidence do we have that photosynthesis happens more than Respiration?

How do we measure atmospheric pressure?

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