NASA has opened voting for its TournamentEarth 2014 photo competition, which takes Earth images captured by satellite and makes them go head to head. Users (that's you!) vote on the best shots, which then go on to the final round. You can create your interactive bracket here. Note: Voting ends Friday, March 14.
Our favorite to take the whole thing: An eruption at Kliuchevskoi, a stratovolcano on the Kamchatka Peninsula of Russia (above) was photographed by the Expedition 38 crew aboard the International Space Station.
Tristan da Cunha, an island in the southern Atlantic Ocean, is more than 2,300 miles (3,700 kilometers) from the coastline of Antarctica. A volcano sits at the island's center.
"The last known eruption of Tristan da Cunha took place in 1961–1962," writes William L. Stefanov for NASA, "and forced the evacuation of the only settlement on the island, Edinburgh of the Seven Seas, on the northern coastline (obscured by clouds in this image). The town is considered to be the most remote permanent settlement on Earth, with its nearest neighbor located 2,173 kilometers (1,347 miles) to the northeast on the island of St. Helena."
Alaska is the cloudiest region of the United States, reports the space agency, but last summer, NASA's Terra satellite caught a rare, nearly cloud-free view.
In early November of 2013, a large iceberg calved off the front of Antarctica’s Pine Island Glacier, which was captured by the Operational Land Imager on the Landsat 8 satellite.
In late January 2013, snow blanketed Great Britain from London in the south to Edinburgh, Scotland, in the north. The image was captured by the The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite. But you knew that.
The Canary Islands appear to have tails made by smooth and choppy water, and the reflection of sunlight. The image was captured by the same satellite that photographed Great Britain under snow.
All of these images are in the current Round of 16. Got a favorite? You can't win if you don't play.