Alaska Peninsula: geography, geology, ecology, and human use Alaska Peninsula Long, volcanic peninsula in southwestern Alaska separating the Pacific Ocean and Bering Sea; notable for rugged terrain, active volcanism, rich fisheries and wildlife refuges.
Caldera (volcanic collapse formation) Caldera A caldera is a large volcanic depression formed when a magma chamber empties and the ground above collapses; this article explains formation, types, famous examples, impacts and mo…
