Articles tagged with "geology"
Volcanoes
January 19, 2009
New! Free Volcano Printout Volcanoes erupt because the earth's movement causes openings or vents in the crust. Volcanoes can be mountains, vents or under sea rifts. Volcanism is an eruption of molten rock at the earth's surface. Sometimes there is explosive gases and rock fragments. Magma is soft rock in …