Composition of Earth's Atmosphere
What is something in the air that varies greatly from place to place and time to time.
water vapor
Name two things you can feel from the atmosphere?
wind, precipitation, energy
What does a fire need to burn?
oxygen
What happens to the air pressure the higher altitude you go?
The air pressure lowers.
To calculate the density of a substance divide its mass by its what?
volume
Gases in the air that are present in very small amounts are called what?
trace gases
True or False: Events in one part of the atmosphere affect other parts of the atmosphere?
True
What do plants need to make food?
carbon dioxide
As altitude increases, the density of the air does what?
descreases
In a weather report, most use what as units of air pressure?
inches
What makes up about 21% of the atmosphere?
oxygen
What is the driving force of the motions of the atmosphere?
Sun
The term used to describe the condition of Earth's atmosphere at a given place or time is what?
weather
True or False: Air pressure is the result of the weight of a column of air pushing on an area?
True
Air pressure doesn't crush you because molecules in the air push how?
The molecules push in all directions.
What do dust, smoke, salt, and chemicals have in common?
They are particles in the air.
What is water vapor?
water in the form of a gas
Clouds form when water vapor does what out of the air?
condenses
The level of mercury in a barometer falls as the air pressure does what?
falls
The amount of mass in a given volume of air is what?
density
What is the most abundant gas in the atmosphere?
nitrogen
What is the difference between wet air and dry air?
Dry air contains no water vapor, while wet air does.
Name the four parts of the atmosphere that interact?
Sun, air, temperature, wind
Air pressure at sea level is what in comparison to the air pressure at the top of a mountain?
greater
What would happen if you carried a barometer down a mine shaft?
Air pressure would increase because the amount of air above you increases.