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Gravitational anomalies reveal seamount 3 times the height of world's tallest building

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Four gigantic seamounts have been found off the coast of Peru and Chile .

The tallest rises more than 1.5 miles ( 2.4 kilometers ) from the seafloor, making it three times taller than the world's tallest building.

Seamounts are so massive that they create subtle changes in the height of the ocean's surface.

The largest seamount, found off Chile , rises 8,796 feet ( 2,681 m), bringing it to within a mile of the surface.