BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Crater lake. Aerial view of the crater lake in the caldera of Maly Semiachik, an active volcano. A caldera is a basin-shaped depression caused by eruption, subsidence or erosion. The hot acidic lake is heated by the volcano. Its bright blue colour is due to the complex combinations of chemicals present in the water. Maly Semiachik is part of the Karymsky group of volcanoes on Russia's Kamchatka Peninsula.
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