Ring of FireEncyclopedia. National Geographic. Viitattu 15.12.2018. (englanniksi)
thoughtco.com
Andrew Alden, Andrew Alden is a writer, photographer, geological tour guide His six years with the U. S. Geological Survey included research excursions on l, At Sea: Here are the Sizes of Tectonic or Lithospheric PlatesThoughtCo. Viitattu 14.12.2018. (englanniksi)