Density is the amount of mass in a certain .
Air results from a column of air pushing on an area.
Airplanes fly best in .
The temperature in the troposphere as you go higher, and in the stratosphere, it as you go higher.
The temperature in the troposphere as you go higher, and in the stratosphere, it as you go higher.
A measure of how tightly air molecules are packed together is called .
How does altitude affect air pressure and density? Check all that apply.Air is less dense on a mountaintop than at sea level.Air pressure is lower at low altitudes.As you climb a mountain, air pressure increases.More force pushes on the air at the bottom of an air column.As you descend a mountain, air molecules are closer together.
The layers of the atmosphere are characterized by changes in .
The troposphere experiences large changes in .
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