However you plan to observe the April holiday, make sure to brush up on your planetary proficiency with this fun and fascinating Earth Day quiz. Test your knowledge on all things related to the ...

you'll find a variety of Earth Day facts below that you might not already know. In this collection of trivia bits, you'll find interesting facts on how the observation got its start, the founders ...

And there are plenty of interesting Earth Day facts to learn! But, first, a little background. Earth Day falls on April 22 ...