The Atmosphere

What caused the atmosphere to form?

• heat

• pressure

• gravity

• magnetism

The atmosphere regulates the earth's ______________________.

What percentage of the atmosphere is oxygen?

• 78%

• 21%

• 12%

• 1%

The atmosphere is made mostly of ______________ gas.

What distinguishes the layers of the atmosphere?

• height

• altitude

• distance

• temperature

What happens in the troposphere?

• meteors burn up

• the ozone absorbs the sun's radiation

• weather

• the temperature increases

What happens in the stratosphere?

• meteors burn up

• ozone absorbs the sun's radiation

• weather

• the temperature decreases

What happens in the mesosphere?

• meteors burn up

• ozone absorbs the sun's radiation

• weather

• the temperature increases

The ISS (International Space Station) is located in the __________________.

The exosphere has the _______________ density.