Gases

This gas makes up 78% of the Earth's atmosphere and is essential for nitrogen fixation in plants

• Nitrogen

• Oxygen

• Carbon Dioxide

"This gas is crucial for life on Earth and makes up 21% of the atmosphere."

• Nitrogen

• Oxygen

• Carbon Dioxide

"This gas is a trace element in the atmosphere but is critical for causing global warming."

• Oxygen

• Nitrogen

• Carbon Dioxide

"Which gas is most responsible for the greenhouse effect?"

• Oxygen

• Carbon Dioxide

• Nitrogen

"What percentage of the atmosphere is made up of oxygen?"

Which layer of the atmosphere is closest to Earth’s surface?

• Stratosphere
  

• Mesosphere
  

• Thermosphere
  

• Troposphere

Which gas makes up the largest portion of the Earth’s atmosphere?

• Carbon Dioxide
  

• Oxygen
  

• Nitrogen
  

• Argon

What is the main component of the Earth's atmosphere that is not a greenhouse gas?

• Oxygen

• Nitrogen

• Carbon Dioxide