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which layer of the atmosphere contains most of the atmosphere and is where most weather takes place?


which 2 gases make up most of earth's atmosphere,and what is the percentage of each?

Nitrogen- 78%
Oxygen- 21%

which layer of the atmosphere contains the ozone layer and what does it protect us from?

Stratosphere. Protects us from the sun's harmful UV rays.

________ is a measure of how rapidly or slowly molecules move around.


what is the freezing point of water in degrees celsius?

0 degrees celsius

what is the boiling point of water in degrees celcius?

100 degrees celsius

what is air pressure?

the force exerted on a surface from the air above.

As elevations increaes, what happens to air density?


what causes wind?

differences in air pressure.

wind always moves from ___ to ____ pressure.

high to low.

what is humidity?

the amount of water vapor/moisture in the atmosphere.

The temperature to which air must be cooled to reach saturation

dew point

what is the relative humidity when the temperature and the dew point are the same?


_________ occurs when water vapor changes into a liquid.


small particles in the atmosphere in which cloud droplets from are called

condensation nuclei

what is the difference between stable and unstable air?

stable: resists rising.
unstable: rises in the atmosphere.

how can you change the temperature of an air mass without adding or removing heat?

adiabatic process.

all forms of water that fall from clouds is referred to as


when a mass of cold air collides with a mass of warm moise air, the ____ air mass rises, cools condenses, and ____ form.

warm, clouds.

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