Atmosphere

Which gas is most abundant in our atmosphere?

• Water vapor
• Nitrogen
• Oxygen
• Carbon dioxide

In which layer of the atmosphere is the air the most dense?

• Thermosphere
• Mesosphere
• Stratosphere
• Troposphere

The layers in the atmosphere are based on which characteristic?

• Absolute temperature
• Amount of water vapor
• Temperature trend
• Air pressure

How much of the troposphere is comprised of oxygen?

• 21%
• 78%
• 1%
• 10%

Which layer of the atmosphere contains the ozone layer?

• Thermosphere
• Mesosphere
• Stratosphere
• Troposphere

In which later of the atmosphere does weather occur?

• Thermosphere
• Mesosphere
• Stratosphere
• Troposphere

As altitude increases in the atmosphere, temperature 

• Increases only
• Decreases only
• Decreases, then increases, then decreases, then increases
• Increases, then decreases

In which layer is air pressure the highest?

• Thermosphere
• Mesosphere
• Stratophere
• Troposphere

Starting at the surface of Earth, the layers of the atmosphere are

• thermosphere, stratosphere, mesosphere, troposphere
• thermosphere, mesosphere, stratosphere, troposphere
• troposphere, stratosphere, mesosphere, thermosphere
• troposphere, mesosphere, stratosphere, thermosphere

What is the percentage of nitrogen in Earth's atmosphere?

• 78%
• 21%
• 90%
• 1%