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Originally Posted by Paajtor
What is it made of?
Is the remains of a volcano?
Sometimes, the magma-cone is all that is left, after erosion has carved away the rest of the volcano.
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You're quite correct. The basaltic-to-andesitic pillar is the remnant of a large stratovolcano that is 28 km wide at its base and rises 2200 m above the sea floor.