Atmosphere 3/21: Key Concepts and Facts

What percentage of the air we breathe is Nitrogen?

• 21%

• 78%

• 1%

• 50%

The ozone layer is located within the ________.

• Troposphere

• Mesosphere

• Stratosphere

• Thermosphere

Which layer of the atmosphere is the outermost layer?

• Troposphere

• Mesosphere

• Stratosphere

• Thermosphere

At what altitude do planes typically fly?

• 9 km

• 50 km

• 100 km

• 705 km

The air we breathe contains 21% ________.

• Nitrogen

• Oxygen

• Argon

• Carbon Dioxide

Which layer of the atmosphere contains the protective ozone layer?

• Troposphere

• Mesosphere

• Stratosphere

• Thermosphere

What is the temperature at the top of the Mesosphere?

• 90°C

• -3°C

• -75°C

• 230°C

Which layer of the atmosphere is closest to the Earth?

• Troposphere

• Mesosphere

• Stratosphere

• Thermosphere

The atmospheric pressure ________ with increasing altitude.

• increases

• decreases

• remains constant

• fluctuates

What is the main component of the air we breathe?

• Oxygen

• Argon

• Nitrogen

• Carbon Dioxide