3. Mount Everest is the highest mountain in the world.
Undoubtedly, many people think that Mount Everest is the highest mountain. It’s called that because it has the highest elevation above sea level. If we consider the total height of mountains, Everest isn’t the highest summit. Mauna Kea, a volcano located in Hawaii, has an altitude of 13,796 ft and its base is about 19,039 ft below sea level.