Volcanoes are grouped into four types: cinder cones, composite volcanoes, shield volcanoes and lava volcanoes. Cinder cones are circular or oval cones made up of small fragments of lava from a single ...

Most volcanoes form at the boundaries of Earth's tectonic plates, which are huge slabs of crust and upper mantle that fit together like puzzle pieces. Think of these plates as massive rafts floating ...

Volcanic eruptions frequently interfere with human affairs; impacts range from minor nuisances to major disasters. Some 50 to 65 different volcanoes typically are active in any given year, and among ...

Volcanoes are exciting and seeing molten lava is a thrill. To see active volcanoes, head to a U.S. National Park that preserves volcanoes or parts of volcanoes. At a National Park, visitors can learn ...