Many layers of atmosphere coat our planet including the mesosphere, ionosphere, exosphere, and the thermosphere, but it’s the troposphere, closest to the planet itself, that supports our lives and is, in fact, the thinnest at only about 10 miles high.

This fact and many other little known things about the world are featured in this article. http://listverse.com/2007/11/20/top-10-amazing-earth-facts/

From space debris that rains down to undiscovered oceans, this article is a great read!