___________is the result of the weight of a column of air pushing on an area.

• air pressure
• density
• volume
• none of the above

What does the air consist of?

• molecules
• helium
• density
• weather

What direction do the molecules go in the air?

• everywhere
• no where
• there are no molecules
• downward

________is the instrument used to measure air pressure.

• barometer
• thermometer
• mercury
• watch

What is another word for altitude?

• elevation
• barometer
• circumference
• weight

As you climb up a mountain what happens to the air pressure?

• decreases
• increases
• stays the same

What happens to the oxygen molecules as altitude increases?

• fewer molecules
• more molecules
• same amount of molecules
• nothing happens to the molecules

Heat transfer between two substances that are in contact with each other is called

• conduction
• convention
• convection
• radiation

Convection takes place because

• warm air is more dense than humid air
• warm and cold air have the same density
• cold air is less dense than warm air
• cold air is more dense than warm air

Winds are caused by differences in

• precipitation
• humidity
• air pressure
• turbulence