How much do you know about Earth Day? Take our quiz!

April 22 marks the 42nd anniversary of Earth Day, a day intended to inspire awareness and promote appreciation for the environment. So it's time to test your knowledge of Earth Day history, trivia and statistics. 

2. How many countries celebrate Earth Day every year?

Some 175 countries around the world observe Earth Day on April 22. Some cities start celebrating a week in advance in recognition of Earth Week.

Some 175 countries around the world observe Earth Day on April 22. Some cities start celebrating a week in advance in recognition of Earth Week.

Some 175 countries around the world observe Earth Day on April 22. Some cities start celebrating a week in advance in recognition of Earth Week.

Some 175 countries around the world observe Earth Day on April 22. Some cities start celebrating a week in advance in recognition of Earth Week.

AP Photo/California State Parks Foundation, Darryl Bush, HO
(Read caption)

10

 

37

 

95

 

175

 
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