What geological process created the unique volcanic caldera of Santorini (Thera) in the southern Aegean?
Answer and explanation
Correct answer: B. Catastrophic collapse of a magma chamber during a major eruption
- Step 1: The Minoan eruption of Thera (around 1600 BC) was one of the largest explosive volcanic events in human history. As millions of cubic meters of magma were ejected, the unsupported volcanic cone collapsed into the empty magma chamber, forming the vast sea-filled caldera. Answer: Catastrophic collapse of a magma chamber during a major eruption. Why not the others: "Gradual erosion by marine waves" causes coastal sea arches and cliffs, incapable of creating a massive 12-kilometer volcanic caldera; "Glacial gouging during the ice age" describes glacial fjords in Norway or lakes in Canada, inapplicable to the volcanic Aegean; "Tectonic uplift of limestone beds" describes orogeny and mountain building rather than explosive volcanological collapse.
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