Erongo Massif - Satellite Photography train grease ice consists of a

grease ice consists of a viscous mix of tiny ice crystals and resembles an oil slick on the ocean's surface

Wipe clean

nestles in a fertile valley flanked by arid mountains

these rocky islands are too cold to sustain more than a smattering of low-growing vegetation

Its source is the currently dormant Anyuyskiy Volcano orange circular shape at the right end of the streak) in northeastern Russia

Erongo Massif - Satellite Photography train grease ice consists of aThe dark heart in this vivid African landscape is the Erongo Massif, an isolated, sheer walled mountain that rises 1,200 meters (3,937 feet) above arid Namibian plains. The massif is a remnant of a gigantic volcano that was active roughly 150 million years ago. At some point, the volcano's center collapsed in upon itself under the weight of overlying lava.