Ash released from shield volcanoes often builds up around the vent forming a steep, round hill known as a cinder cone. A lava tube may also form, beneath the surface of the ground, when low ...

Cinder cones are the smallest and simplest type of volcano. But that doesn't mean they can't pack a punch. Best described as steep, conical hills, cinder cones are formed by pyroclastic rock ...

Steep-sided cinder cones form quickly during brief ... It’s an extinct stratovolcano with steep sides and a classic cone shape. Arizona’s volcanic activity is rare compared to other parts of the West ...