What is the coldest layer of the atmosphere?

• Mesophere
• Thermosphere
• Stratosphere
• Troposphere

Nitrogen makes up what percent of our atmosphere?

• 21%
• 1%
• 87%
• 78%

Which two gases are found throughout all layers of the atmosphere?

• nitrogen and methane
• nitrogen and ozone
• nitrogen and oxygen
• nitrogen and hydrogen

Which of the following lists the layers of the atmosphere in order from Earth’s surface to space?

• Thermosphere, Stratosphere, Mesosphere, Thermosphere, Exosphere
• Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere
• Thermosphere, Stratosphere, Mesosphere, Exosphere, Thermosphere
• Troposphere, Mesosphere, Stratosphere, Thermosphere, Exosphere 

Which of the following is one of the trace gases found in Earth’s atmosphere? 

• gold
• nitrogen
• oxygen
• carbon dioxide

What is ozone?

• a form of oxygen found in a layer in the stratosphere
• a form of nitrogen found in a layer in the stratosphere
• a form of oxygen found in a layer in the troposphere
• a form of nitrogen found in a layer in the mesosphere

Which two gases most greatly affect Earth's weather?

• water vapor and nitrogen
• water vapor and carbon dioxide
• water vapor and argon
• water vapor and oxygen

In which layer of the atmosphere does weather occur?

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

Which layer of the atmosphere is closest to space?

• Troposphere
• Stratosphere
• Exosphere
• Thermosphere

Which layer of the atmosphere has the greatest air pressure?

• Troposphere
• Stratosphere
• Mesosphere
• Exosphere