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?

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

10

 

37

 

95

 

175

 
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