Atmosphere

Which gas makes up 78% of the atmosphere?

• Oxygen

• Carbon Dioxide

• Nitrogen

Which gas makes up 21% of our atmosphere?

• Nitrogen

• Oxygen

• Carbon Dioxide

This is the source of all heat energy in our atmosphere

• Moon

• Sun

• Water

Earth's atmosphere traps energy from the Sun, which

• allows ozone to form

• allows water to exist as a liquid

Air has pressure because

• air is warm

• air has mass

• the troposphere is in the tropics

The instrument that we use to measure air pressure is called

• thermometer

• hydrometer

• barometer

As you move from sea-level to the top of a mountain, air pressure

• increases

• decreases

When climbing a high mountain, you get out of breath more easily because

• The percentage of oxygen decreases

• the air is more dense

• there is less oxygen in each cubic meter of air

As temperature increases, air pressure will

• increase

• decrease

As temperature decreases, air pressure

• increases

• decreases