Mount Everest is indeed the world's highest mountain, with its peak standing at 8,849m (that's 8.8km) above the ocean.

As Mount Everest is considered the highest mountain over sea level, Mount Chimborazo and Mauna Kea each mount interesting cases. Each feature, in its way, contributes to the contrasting measurements.

The highest mountain ranges are created by tectonic ... As it cools down, the lava creates a long line of mountains under the ocean called the Mid-ocean Ridge - the longest mountain range on ...