Sunset Crater National Monument - Arizona
Sunset Crater Volcano was born in a series of eruptions sometime between 1040 and 1100.
Photo credit to National Park Service
Mark W. Kaelin has been writing and editing stories about the IT industry, gadgets, finance, accounting, and tech-life for more than 25 years. Most recently, he has been a regular contributor to BreakingModern.com, aNewDomain.net, and TechRepublic.