World’s Highest Active Volcano
Wednesday, December 7, 2011 8:59:55 AM
They are all three stratovolcanoes, not surprisingly with their location in the Andes above an active subduction zone (“subduction volcanoes”). You may argue that Ojos del Salado is the least beautiful of the three. It is less symmetrical and conical, and due to its location near the Atacama desert, the mountain has very dry conditions with snow only remaining on the peak during winter. The name means "Source of the Salt river", which comes from the enormous deposits of salt that, in the form of lagoons or “eyes”, appear in its glaciers. These salt deposits are another result of the dry condition.
View of the Chilean summit of Ojos del Salado, the highest volcano of the world, from the Argentinian summit - imagee made available to Wikipedia by its author, Janne Corax.
All the world's volcanoes higher than 6000 m are by the way located in South America.
PS of 8 December 2011:
Why are the world’s highest volcanoes in South America? “Sandatlas” has come up with some ideas at http://www.sandatlas.org/2011/12/highest-volcanoes-are-in-south-america-why/