To celebrate Earth Day, here are some awesome pictures.

Bombetoka Bay on the northwestern coast of Madagascar

"Captured in 2000 by a NASA satellite, the scene shows where the salty waters of the Mozambique Channel mingle with freshwater outflow from the island's Betsiboka River."

Volcano Bubble

"A "bubble" of steam surrounds volcanic ash rising from Sarychev Volcano, on the northwestern end of Matua Island, in a June 2009 picture taken by an astronaut."

Painted Desert

"In the Simpson Desert of central Australia (see map), a recent fire is revealed by the vivid orange scars of plant-free sand seen in this 2002 astronaut photograph."

Aurora over Earth

"During a geomagnetic storm, a neon green ribbon of aurora australis danced over Earth in this 2010 photograph taken by an astronaut on the International Space Station."

Circles of Life

"Fields near the city of Perdizes, in the Minas Gerais state of Brazil, are seen in a 2011 astronaut photograph."

Model City

A fog-free San Francisco is seen in this 2004 oblique-angle satellite photograph."

Blue Planet

"Eleuthera Island in the Bahamas is seen in a 2002 astronaut photograph taken from the International Space Station."

Reflections on a Disaster

"Spilled oil from the Deepwater Horizon disaster in the Gulf of Mexico is seen offshore of Petit Bois Island and Horn Island in eastern Mississippi in a June 2010 satellite picture."

Web of light

"Seen in a 2003 astronaut photograph, the city of São Paulo, Brazil —home to 17 million people—stands out like a beacon in the night. The variations in color are due to the city using different types of streetlights, according to NASA."

Circulation System

"Tidal flats and channels on the western side of the Bahamas' Long Island are seen in a 2010 astronaut photograph."

Thunderstorm over Asia

"A thunderstorm hovers over Asia in a 1999 astronaut photograph taken from the space shuttle Columbia."

Scenic Routes

"The ever shifting Rio Negro and many of its past paths curl across the Patagonia region of Argentina in a 2010 astronaut photograph taken from the International Space Station."

Caustic Waters

"Vivid Lake Natron in Tanzania—said by NASA to be the world's most caustic body of water—is a threatening shade of orange in a 2005 satellite image."

March to the Sea

"The Neumayer Glacier on South Georgia Island, east of the southern tip of South America, creeps ever closer to the ocean in a 2009 satellite image."

Made by Meteorite

"In a satellite image released in 2004, salty seasonal lakes are brightly evident within the Shoemaker impact structure—at 1.7 billion years old, the oldest known meteorite-impact site in Australia"

Sea Snakes

"Gullies slithering through sandbanks are seen in the Wadden Sea, near the Netherlands, in a 2006 satellite image."

Iceberg Nursery

"In a 2010 satellite picture, the Matusevich Glacier calves new icebergs into an Antarctic channel, which cuts between the Lazarev Mountains and the Wilson Hills."

Desert's End.

"In Eastern Algeria's stretch of the Sahara, the Tifernine Dune Field—a section of the Grand Erg Oriental dune sea—meets the Tinrhert Plateau, as seen in a 2008 astronaut photograph."

Cloud Vortices

"Cloud vortices, or von Kármán vortices, create patterns in the sky near the Cape Verde Islands off northwestern Africa."

Fresh Flows

"Fresh, dark lava flows cover the Hawaiian volcano Kilauea, on the Big Island, as seen in a 2003 satellite picture."