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The Askja Caldera, Iceland

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Askja is a caldera located in a remote part of the central highlands of Iceland. Calderas are large,
 

Daily Overview

August 7 · Issue #337 · View online
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Askja is a caldera located in a remote part of the central highlands of Iceland. Calderas are large, cauldron-like hollows that form after the magma chamber of a volcano is evacuated and the earth above collapses into it. Askja is roughly 2.8 miles (4.5 km) in diameter and is accessible only a few months out of the year — in fact, the region in which it is located is so remote and otherworldly, it was used as a training site for NASA’s Apollo program to prepare astronauts for lunar missions.
65°01'48.0"N, 16°45'00.0"W

Source imagery: DigitalGlobe

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