Composition

Which gas makes up the majority of Earth's atmosphere?

• Nitrogen

• Oxygen

How does the troposphere differ from the stratosphere?

• The troposphere contains weather, while the stratosphere does not.

• The troposphere is colder than the stratosphere.

Which layer of the atmosphere protects Earth from meteors by burning them up?

• Stratosphere

• Mesosphere

Which factor has the greatest impact on global warming?

• High amounts of greenhouse gases in the atmosphere

• More water vapor in the troposphere

Imagine astronauts are designing a new space station that will orbit in the thermosphere. What challenges will they face?

• High levels of radiation

• Lots of birds flying