More than 600 cinder cones comprise the 1,800-square-mile San Francisco Volcano Field and its south-central edge of Flagstaff in Coconino County.

Specimens occur in volcanic tuff becoming larger and more plentiful along the 1 mile hike to the amphitheater or exposed interior of the cinder cone, which was caused by a phreatomagmatic eruption ...

Our vibrant nation of the Philippines is one of the most climate-vulnerable countries in the world. Subject to tropical ...