Atmosphere and Its Layers

What percentage of Earth's atmosphere is nitrogen?

• 21%

• 78%

• 50%

• 93%

Which gas is essential for respiration?

• Carbon dioxide

• Methane

• Oxygen

• Argon

The troposphere is the layer where:

• Auroras occur

• Aircraft fly

• Weather happens

• Meteoroids burn

In which atmospheric layer is the ozone layer found?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

Which layer of the atmosphere merges with outer space?

• Thermosphere

• Troposphere

• Exosphere

• Stratosphere

What gas makes up about 0.93% of the atmosphere and is inert?

• Carbon dioxide

• Methane

• Argon

• Ozone

What is the most abundant greenhouse gas?

• CO₂

• CH₄

• N₂O

• Water vapor

Which layer is known for burning up meteoroids?

• Stratosphere

• Mesosphere

• Thermosphere

• Troposphere

Atmospheric pressure is highest at:

• High altitudes

• Sea level

• Mountain peaks

• The exosphere

What is the average atmospheric pressure at sea level?

• 100 mb

• 1013 mb

• 2000 mb

• 500 mb