Get the Facts
Photograph by Olivier Grunewald
A camera's long nighttime exposure reveals the red glow of lava spilling from Mount Ol Doinyo Lengai in Tanzania's Rift Valley. The volcano’s lava, which appears brown to the naked eye, has the consistency of olive oil.
Buy the book Visions of Earth » Watch a video of highlights from the book » See more pictures in our monthly Visions of Earth feature »
Send to a Friend
© 1996-2013 National Geographic Society. All rights reserved.