THE WORLD'S LONGEST MOUNTAIN CHAIN IS UNDERWATER. THE MID-OCEAN RIDGE, IS ALMOST ENTIRELY BENEATH THE OCEAN, STRETCHING ACROSS A DISTANCE OF 65,000 KM.

THE WORLD'S LONGEST MOUNTAIN CHAIN IS UNDERWATER. THE MID-OCEAN RIDGE, IS ALMOST ENTIRELY BENEATH THE OCEAN, STRETCHING ACROSS A DISTANCE OF 65,000 KM.