L2 Notes: The Natural Greenhouse Effect

Multiple Choice

What is the the natural greenhouse effect?

• The natural greenhouse effect cools the Earth's surface by reflecting sunlight.
• The natural greenhouse effect is caused solely by human activities.
• The natural greenhouse effect refers to the depletion of ozone in the atmosphere.
• The natural greenhouse effect is the warming of Earth's surface due to the trapping of heat by greenhouse gases in the atmosphere.

Multiple Choice

How much of the Earth's atmosphere is made of Nitrogen?

• 72%
• 90%
• 85%
• 78%

Multiple Choice

How many main greenhouse gases are there?

• 3
• 5
• 2
• 4

Multiple Choice

What are the three main greenhouse gases?

• Nitrogen

• carbon dioxide, methane, water vapor

• sulfur dioxide
• oxygen