Atmosphere, atmospheric pressure..

What percentage of the earth's atmosphere is oxygen?

• 78%
• 28%
• 71%
• 21%

As we go higher in  the atmosphere, the air pressure

• decreases
• increases
• does not change
• gets heavier

What layer of the atmosphere protects us from meteors?

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

Which layer of the atmosphere is the coldest?

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

Which layer of the atmosphere is the hottest?

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

Density of air is greater ________.

• at the top of the mountain
• at the bottom of the mountain
• at the center of the mountain

Air pressure is greater _______.

• at the top of the mountain
• at the bottom of the mountain
• at the center of the mountain

A device that is used to measure atmospheric pressure is a ___________.

• barometer
• thermometer
• kilometer
• micrometer

What happens to air pressure as you move upward into the atmosphere?

• increases
• decreases
• stays the same

What does the air consist of?

• molecules
• helium
• density
• weather