Imagery of the Mid-Atlantic Ridge. Photo:

2. The Largest Mountain Chain On Earth Is Underwater

The longest mountain chain on the earth’s surface is the Andes, which runs like a corridor through South America. This chain is 4350 miles long, which may sound like a lot but is dwarfed by the Mid-Ocean Ridge. The Mid-Ocean Ridge, which is 40,390 miles long, runs throughout the earth’s oceans like the seams on a baseball.

The Mid-Ocean Ridge is over 90% underwater and was formed by tectonic activity that caused magma to push up onto the surface of the ocean floor. Many of the mountains are actually volcanoes that erupted underwater.