Cinder cones are simple volcanoes that form where vents, or openings, spit out ash and lava. They can be cone- or oval-shaped, usually with a bowl-like crater at their summits. When a cinder cone ...

This striking satellite photo shows the unusual shape of Spirit Lake ... making it the deadliest volcanic eruption in U.S. history. It also caused around $1 billion in damages (equivalent to ...