Under Sahara

http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=16963

How does a scientist know that the vast, featureless sand fields of the
Sahara once ran with water? Water leaves its mark on the land, cutting
channels and canyons where rivers flowed and leaving depressions where
lakes once pooled. In the Sahara, however, these features are filled with
sand. A scientist would have to look under the sand to find the imprint of
water from wetter climates. These images of the Safsaf Oasis in
south-central Egypt do just that: the top image shows the surface of the
desert, while the lower image reveals the water-carved rock under the
sand.

Author: Jorah Lavin

I grew up in New England, moved to the Carolinas in '98 to start working at what was then a large regional bank and is now a really big nationwide bank. I work doing intranet content management and intranet site management for said bank. After work, I watch movies & eat. I've been studying Aikido since 2014, and I ride an old Honda Shadow. Someday I want to go skydiving.