Libyan Desert Glass
Credit: By H. Raab (User:Vesta) (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or CC-BY-SA-2.0-at (http://creativecommons.org/licenses/by-sa/2.0/at/deed.en)], via Wikimedia Commons
This image is originally part of the article Natural Glass, 4 Stunning Anomalies
Libyan Desert Glass. Created when a meteor exploded above earth millions of years ago, showering the Saharan desert with radiation. The radiation melted the sand into glass sheets.