A magnitude 7.8 earthquake struck Nepal early on Saturday, centered 10 miles below the surface, less than 50 miles from the capital of Kathmandu. At least 1,100 are already reported to have been killed by the quake and subsequent avalanches triggered in the Himalayas.
The editors of Smithsonian magazine have announced the winners of their 12th annual photo contest, selected from more than 26,500 entries.
Chile's Calbuco volcano erupted on Wednesday, spewing a giant funnel of ash high into the sky over a sparsely populated, mountainous area, triggering a red alert. Authorities ordered an evacuation for a 10-kilometer (six-mile) radius around the volcano.
First organized in 1970, Earth Day is a day set aside to remember and appreciate the Earth's environment, and our responsibilities and roles within it. Today, April 22, we observe the 45th annual Earth Day, and though many things have changed for the better, environmental challenges remain.