NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Mauna Loa volcano summit crater, Hawaii, seen from the International Space Station (ISS). This summit crater (caldera) is called Mokuaweoweo Caldera. It is 4170 metres above the sea, but the volcano, one of the world's most active, rises 9 kilometres from the seabed. The dark areas either side are recent lava flows on the volcano's slopes. The caldera measures 4.3 by 2.5 kilometres. A weather observatory is on the volcano's northern slopes (white, bottom left). The Hawaiian Islands, found in the Pacific Ocean, are the tops of underwater volcanoes. The ISS orbits the Earth at an altitude of around 380 kilometres. Photographed on 6 July 2002.
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