GEOL 1001 Study Guide - Final Guide: Pyroclastic Flow, Magma Chamber, Lava Tube
Document Summary
***volcanic eruptions transfer materials from inside the earth to the planets surface. ***low silica/high fe and mg: mafic and basaltic. ***moderate silica, fe and mg: intermediate and andesitic. ***high silica/low fe and mg: silicic, felsic, and rhyolitic. ***lava tubes prevent cooling, facilitating flow for miles, eventually drain and make caves. ***andesitic- moderate silica content, more resistant to flow. ***rhyolite- highest silica content, most resistant to flow, tends to pile into mounds at the vent. *** volcanoes erupt lava, pyroclastic debris, and gas. ***when magma rises it can sometime escape through cracks called fissures; may display curtain of fire. ***subaerial lava flowing on land cools slower than submarine lava which is quickly cooled. ***volcanoes erupt from chimney like conduits or fissures. ***most lava erupts along the mid ocean ridge. ***continental rifts form because of partial melting of the mantle and partial melting of the crust. ***lava flow flows quickly and spreads; able to destroy immovable objects.
