Premise: Santorini looked exactly like many of the other islands in the Cyclades until around 1500 b.c. , when a massive eruption of its volcano carried the whole interior of the island high into the atmosphere, changing the climate of the earth for years afterwards.
Hypothesis: Santorini has always look like all the other islands, the mountain is a volcano but it isn't active.
Is the hypothesis entailed by the premise?
no