Mountains Under Water (Mid Ocean Ridges)?

What? There are mountains under the water; in our oceans? Wow, that's amazing. These mountains are called Mid-Ocean Ridges. These big mountains are the biggest mountains in the world, even bigger than Mt. Everest and longer than the Andes. These mountains are made by volcanic activity and earths plates moving together. Also in the oceans if the plates spread apart instead of colliding, this is called Sea Floor Spreading. If you want to learn more about the Mid-Ocean Ridges you can look at these links below.

About Mid-Ocean Ridges:
http://www.pmel.noaa.gov/vents/nemo/explorer/concepts/mor.html

About Sea Floor Spreading:
http://library.thinkquest.org/17457/platetectonics/4.php