HiRISE (NASA)
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HiRISE 3D: Volcanoes and Collapses

This image of Hephaestus Fossae shows a volcanic area where collapses like this happen. Chains of large elliptical pits mark the path that underground molten rock took.

uahirise.org/anaglyph/ESP_0802
NASA/JPL-Caltech/UArizona

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