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Volcanic activity. The undersea mountains developed fissures and the lava kept rising higher and cooling. Eventually the peaks came above the water and the islands were formed.
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Millenniums of volcanic eruptions from magma escaping from the ocean floor. Basically, they're giant mountains made of volcanic rock in which their peaks are the exposed land.
Heavy Volconic eruption from the earth and full of water sourrending it later because of the Heavy eruption from middle which forms a lsland like this...
volcanic magma which has leaked out into the ocean and cooled millions of times. After cooling the magma builded up to make the islands. Keep in mind this process took millions of years to complete.
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