BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Volcano. Aerial photograph of the active volcano Ol Doinyo Lengai, or Mountain of God (upper left). This volcano is in the Rift Valley in northern Tanzania. The summit is 2890 metres above sea level. Ol Doinyo Lengai produces natro- carbonatitic lava, rich in sodium and carbonates. The lava emerges from the crater at between 500 and 590 degrees Celsius, the coolest lava of any known active volcano.
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