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 Earth's natural environment. In honor of the holiday, test your knowledge of Earth Day history, trivia, and statistics.

By Andrew Mach, Contributor

Earth Day volunteers remove weeds as they work to restore Candlestick Point State Recreation Area's community garden, in San Francisco on April 14, 2012.

AP Photo/California State Parks Foundation, Darryl Bush, HO

Question 1 of 20

1. When was the first Earth Day celebrated?

	March 21, 1970

	April 22, 1970

	May 21, 1970

	June 22, 1970