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 ...

Nyamuragira is a dome-shaped shield volcano that stands up to 10,033 feet (3,058 meters) tall, while Nyiragongo is a stratovolcano, with a steep cone that towers up to 11,385 feet (3,470 m ...