ABCs from Space: F

Big F, little f. What begins with F? Firn-filled fjords and frozen forms on folded, fossil-filled facies of rock! Fog, fossil fuels, and faults. France, Fort Collins, and don’t forget Fiji. The Operational Land Imager (OLI) on Landsat 8 acquired this false-color image of valleys and snow-covered mountain ranges in southeastern Tibet on Aug. 4, 2014. Firn is a granular type of snow often found on the surface of a glacier before it has been compressed into ice.