Each spring and summer, as the air warms up and the sunlight beats down on the Greenland ice sheet, sapphire-colored ponds spring up like swimming pools. As snow and ice melt atop the glaciers, the water flows in channels and streams and collects in depressions on the surface that are sometimes visible from space. (via NASA - Greenland Melt Ponds)
(via Image of the Day)
With uses ranging from jewelry to catalytic converters, platinum ranks among the most prized and most expensive metals. About 70 percent of the world’s platinum is mined in the Bushveld Igneous Complex in South Africa—a geological formation roughly the same size as West Virginia. The Bushveld also supplies significant quantities of palladium, rhodium, chromium, and vanadium.
Tristan da Cunha (via Tristan da Cunha, South Atlantic Ocean : Image of the Day)