When you stand outside, you are standing in the…

• stratosphere
• troposphere
• mesosphere
• hydrosphere

Which gas in our atmosphere is most abundant?

• Argon
• Oxygen
• Nitrogen
• Carbon Dioxide

In which layer does the atmosphere have the greatest density of air molecules?

• mesosphere
• thermosphere
• stratosphere
• troposphere

What percentage of our atmosphere is made up of other gases such as argon, carbon dioxide, methane and helium?

• 1%

• 21%

• 78%

• 17%

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

• 99%
• 21%
• 78%
• 15%

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

• 17%
• 21%
• 78%
• 90%

Which layer of the atmosphere contains the greatest amount of water vapor?

• Thermosphere
• Troposphere
• Mesosphere
• Stratosphere

In which layer of the atmosphere does weather occur?

• Mesosphere
• Thermosphere
• Stratosphere
• Troposphere

What DECREASES as you travel up in the atmosphere?

• Altitude

• Atmosphere

• Meteors

• Air Pressure

What is the lowest main layer of Earth's atmosphere?

• Thermosphere
• Troposphere
• Stratosphere
• Mesosphere