Fun Arizona Fact for the Day

In linguistics last night I learned that Arizona once had active volcanos as recently as the 11th century (this is a class known for tangents).

Apparently, the Tucson Mountain Range is all (inactive) volcanos. And the odd-looking rock wall lining campus is made of volcanic rock.

More information: http://wc.pima.edu/~bfiero/tucsonecology/setting/geology.htm "The Tucson Mountains were once the top of a large volcano, the bottom of which is the Santa Catalina Mountains. The top of the volcano slid 20 miles to the west, and the area between the Tucson and Catalina Mountains was dropped down to form the valley."