What's the tallest mountain in the world?
Actually, Mauna Kea is significantly taller if you include the mountain part below sea level. That's why it is not considered the tallest mountain in the world.
Mauna Kea is over 33,500 feet high, making it over 3000 feet higher than Mt. Everest. However, because over half of it is below sea level, it can't be considered as tall as Mt. Everest, let alone taller, due to that it's height is only 13,500 feet above sea level, while Everest is over 29,000 feet above.
Mauna Kea's sister, Mauna Loa, is much larger in terms of area and volume. It's a gigantuan 18,000 cubic miles, whilst Mauna Kea is a lowly 770. But when we're talking about sheer height, Mauna Kea comes out in the top. But not by much! In fact, Mauna Loa is a tiny 120 feet shorter. Talk about frustration! Mauna Kea is so large, it makes the oceanic crust below it depress. Also, due to its own weight, it is flattening and slipping by a rate of 0.2 millimeters a year. Grummen (talk) 18:09, February 19, 2013 (UTC)