Air Pressure

78% of earth's atmosphere is composed of ____? 

• methane
• oxygen
• argon
• nitrogen

When you increase your altitude, the air pressure 

• increases
• decreases
• stays the same

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

The air pressure is _____ when closest to the earth's surface.

• low
• stinky
• high
• thin

Cold air exerts _____________ pressure than warm air

• the same
• more
• less

78% of earth's atmosphere is composed of ____? 

• methane
• oxygen
• argon
• nitrogen

Air pressure is greatest when near Earth's surface because?

• The air molecules are farther apart.
• The air molecules are closer together.
• Air molecules collide.
• Air molecules are tightly packed.

Does cold air rise or sink?

• Rise
• Sink