Click a button to reveal the c.o.o.l. fact to the right.
c.o.o.l. fact #1 The average depth of the oceans is about five times the average elevation of the land. The deepest-known part of the ocean measures 10,924 meters (35,839 feet), in the Marianas Trench near Guam. If the world's highest mountain, Mount Everest (29,141 feet), were to be placed into this trench, it would be covered by over 1.25 miles of water.
c.o.o.l. fact #2 An area of the Atlantic Ocean floor, known as the mid-ocean rift, is full of cracks, sometimes 2,400 meters deep. As a result, water seeps through the earth's crust down to its molten core. This heats the water, causing it to rise back up to the ocean. When it hits the cold ocean water, a cloud is formed. These hot-springs, called hydrothermal vents, can reach 371 degrees Celsius.
c.o.o.l. fact #3 Sometimes magma from the earth's core piles up on the seafloor and forms volcanic mountains called seamounts. When these mountains are large enough to break the ocean's surface, islands form. One example of a series of seamounts is the U.S.'s Hawaiian Islands.
c.o.o.l. fact #4 Coral reefs are massive structures on the ocean floor built by tiny coral animals that live in colonies. The largest coral reef, the Great Barrier Reef off the coast of Australia, is 2,000 kilometers long and 80 kilometers high.