Eruptions on the islands of Santorini in Greece and Krakatau in Indonesia resulted in:

Question

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Both the eruption of Santorini (around 1600 BCE) and Krakatau (1883) resulted in the collapse of a caldera, leading to part of the islands disappearing beneath the sea, the emission of huge ash columns and pyroclastic flows, and the generation of destructive tsunamis that traveled across the sea, impacting coastlines far from the eruption sites.

Eruptions on the Islands of Santorini in Greece and Krakatau