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This allows the formation of large magma chambers, in which the magma can evolve to more silicic compositions.

Once this happens, a large explosive eruption destroys the cone.

Beach sand colour depends on which geological layer is exposed; there are beaches with sand or pebbles made of solidified lava of various colours: such as the Red Beach, the Black Beach and the White Beach.

The metamorphic grade is a blueschist facies, which results from tectonic deformation by the subduction of the African Plate beneath the Eurasian Plate.

Subduction occurred between the Oligocene and the Miocene, and the metamorphic grade represents the southernmost extent of the Cycladic blueschist belt.

It is the most active volcanic centre in the South Aegean Volcanic Arc, though what remains today is chiefly a water-filled caldera.

The volcanic arc is approximately 500 km (310 mi) long and 20 to 40 km (12 to 25 mi) wide.

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