Volcanoes are considered active if they have erupted sometime ... and under the ocean worldwide. Cinder cones are simple volcanoes that form where vents, or openings, spit out ash and lava.

But it is still considered an active volcano ... Four types of volcanoes—shield, composite, cinder cone, and plug dome—can be found in Lassen Volcanic National Park, where they literally ...

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Volcanoes generally come in three flavors: active, dormant ... 2,900 other known volcanic features ranging from small cinder cones to substantial shield volcanoes." Some volcanos, such as at ...