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It's Earth Day? How much do you know -- about the Earth, that is? Published: April 22, 2013

Since the nearest planets that could possibly sustain life appear to be more than 1,200 light years away, it may be wise for Earthlings to do what we can to preserve the nice place we already have, says CNN.

Since 1970, every April 22, Earth Day reminds us to do just that.

The best intentions and actions are driven by knowledge, so here's a little quiz to help you bone up on ecology...

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