Sunset Crater, Arizona, USA

The most recently active of nearly 600 volcanoes in northern Arizona's San Francisco Volcanic Field.

Welcome to Let’s Talk Outcrop, a weekly newsletter delivered every Tuesday where I explain Earth Science topics such as interesting geologic formations, Earth’s structure, physical Earth processes, or natural disasters (earthquakes or volcanoes). Other topics include famous geologic maps, minerals, or interplanetary science. 

All Tuesday articles are fre…