"I fell into a burning ring of fire,
I went down, down, down as the flames went higher..."
The Ring of Fire region contains more than 75 percent of the world's volcanoes (in the same way that Alaska is home to more than 75 percent of all U.S. volcanoes). Think the west coasts of South and North America -- across the Bering Strait -- and the east coasts of Russia/China, along with Japan (10 percent of world's active volcanoes) and Indonesia...
What explains the location of these volcanoes is the "map beneath the map" of oceans and continents that we see. Beneath our water and land forms are the tectonic plates (4 to 40 mile-thick layers of crust and mantle) which interact with each other to form not only volcanoes, but many other of the most significant land forms of the earth. Geologists recognized the great ring of fire before they knew about the plates, and their boundary interactions which account for the up-welling of volcanic molten rock.
A recent article in the British "Daily Mail" had excellent photos of an Indonesian volcano.