Volcanoes A volcano is a vent in the earth from which molten rock and gas erupt. The molten rock that erupts from the volcano forms a hill or mountain around the vent. The lava may flow out as a viscous liquid or it may explode from the vent as solid or liquid particles. Three basic materials that may erupt from a volcano are lava, rock fragments, and gas. Lava is the name for magma that …showed first 75 words of 931 total…

…showed last 75 words of 931 total…escape through a vent made in the side of the volcano, or it may rest below the surface. Volcanoes are very wondrous and amazing. They are one of the most destructive and one of the most beautiful things on this Earth. They contain gas, lava, and tunnels that go many miles into the Earth. They can form new islands or gigantic mountains. The materials that volcanoes erupt can help scientists understand about the inner Earth.