Ocean Currents, time-lapsed by NASA
Sediment runoff from heavy rains shows up as lighter streaks and swirls in the water around New Zealand's Cook Strait.
One in every 15 people on the planet - around 500 million people - call river deltas home. A delta in Bijagos archipelago, West Africa Picture: SPL / Barcroft Media
Mitad del mundo de día y la otra mitad de noche
Fiji Reef The Cakaulevu Reef on Fiji's northern shore shows up in this rare cloudless shot captured by Aqua on July 21, 2011.
I have fond memories of learning geography in seventh grade. My teacher had us memorize all the countries on each continent and I looked fo...