Hawaii's Mauna Loa and Kilauea are both shield volcanoes. Though they don't form a classic cone shape, shield volcanoes can be massive: Mauna Loa has an estimated volume of 18,000 cubic miles ...

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 ...

Four types of volcanoes—shield, composite, cinder cone, and plug dome—can be found in Lassen Volcanic National Park, where they literally bubble and steam.

The cinder cones in Haleakala Crater are as young as ... considered a waning post-shield volcano, has erupted only 10 percent of the volume of the 8,000-foot Hualalai on the Big Island that ...