The Atmosphere

Which gas makes up the greatest percentage of Earth's atmosphere?

• Argon

• Nitrogen

• Nitrous oxide

• Carbon dioxide

This circle graph shows the percentage of different gases in Earth's atmosphere. Which gas is represented by Gas #1?

• Carbon dioxide

• Hydrogen

• Nitrogen

• Oxygen

The pie chart shows the mixture of gases that compose the atmosphere. Which gas composes 21% of the atmosphere?

• Argon

• Oxygen

• Nitrogen

• Carbon dioxide

Layer of the atmosphere where the ozone layer is located:

• troposphere
• stratosphere
• mesosphere
• thermosphere

Layer of the atmosphere that is the coldest:

• troposphere
• stratosphere
• mesosphere
• thermosphere

Which layer of the atmosphere has the greatest amount of air pressure?

• troposphere
• stratosphere
• mesosphere
• exosphere

As altitude increases in the Troposphere, what happens to the air temperature?

• air temperature increases
• temperature decreases
• temperature fluctuates
• temperature rises

This is the layer where meteors, or shooting stars, burn up.

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

Which of the following is the correct order of the atmosphere layers from Earth to space?

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

Which layer has the hottest molecules?

• Thermosphere
• Mesosphere
• Exosphere
• Stratosphere