Arizona Geological Survey at the University of Arizona,
I bet you did not know this.
I bet you did not know this.
Volcanology: "The U.S. is one of Earth’s most volcanically active countries. Since 1980, there have been 120 eruptions and 52…
When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one…
Available for download. ~ESP~