Originally Posted by DSpivack
No, it's the highest, meaning it's elevation is higher about sea level than any other mountain. Tallest is measuring base-to-peak distance. With Mauna Kea, though, 2/3 of it's base is underwater. The tallest mountain on Earth measuring base-to-peak above sea level is Denali/Mt. McKinley.
I can't believe you didn't mention Chimborazo here, the volcano in Peru, whose peak is the farthest point on the Earth's surface from it's center.