GEOL 1001 : Geology Important Test 2 Notes
Document Summary
Chapter 4: up from the inferno: magma and. Volcano: a vent where melt inside the earth spews onto the earth"s surface: ex. Igneous rock: formed from solidification of magma, forming lithospheric melting. *lava is melted rock when it reaches earth"s surface (volcanic eruption) Earth is mostly igneous rock (all oceanic crust is made of igneous rock and most of continental crust is. ) *magma forms because of heat and magma only forms in special tectonic settings heat is due to: accretion process, sinking of materials to form core, decay or radioactive elements on earth. Upper mantle and crust melt through changes in: Felsic: very low density, low temps, very high viscosity with lots of explosive eruptions and a high silica ratio. Intermediate: low density, low temperatures, high viscosity with explosive eruptions. Ultramafic: very high density, very high temps, very low viscosity and very low silica ratio.
