The Great American Volcano

Few countries on the planet suffer from such a varied set of volcanic features as the United States of America. On the western seaboard you have subduction volcanism ranging from long dormant volcanoes to active volcanoes close to cities. As you come up around the tectonic bend into Alaska you get large subduction volcanoes capable…

… but, it’s swollen.

This was originally going to be just a post, then I decided to make it into an article. Not so OT… if you can extend your thinking… “Spall are flakes of a material that are broken off a larger solid body and can be produced by a variety of mechanisms, including as a result of…