Atmosphere & Air Quality

Which layer of the atmosphere is the coldest?

• Troposphere

• Mesosphere

• Thermosphere

• Stratosphere

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

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

As altitude increases, air pressure....

• Increases

• Decreases

• Stays the same

• Goes up and down

Why is the ozone layer vital to life on Earth?

• Planes fly in the ozone layer

• It is made up of oxygen (O₂)

• It shields the Earth from ultraviolet (UV) rays from the sun

• It causes clouds to be created