EARTH 119 Chapter Notes - Chapter 6: Breccia, Geologic Time Scale, Asthenosphere
9 Oct 2016
School
Department
Course
Professor
Document Summary
Earth 119- chapter 6: up from the inferno: magma and igneous rocks. Volcano: a vent from which melt from inside the earth spews out onto the planet"s surface. Magma: molten rock beneath the earth"s surface. Lava: molten rock that has flowed out onto the earth"s surface. Lava flow: sheets or mounds of lava that flow onto the ground surface or sea floor in molten form and then solidify. Igneous rock: rock that forms when hot molten rock (magma or lava) cools and freezes solid. Extrusive igneous rock: rock that forms by the freezing of lava above ground, after it flows or explodes out (extrudes) onto the surface and comes into contact with the atmosphere or ocean. Volcanic ash: tiny glass shards formed when a fine spray of exploded lava freezes instantly upon contact with the atmosphere. Pyroclastic debris: fragmented material that sprayed out of a volcano and landed on the ground or sea floor in solid form.
