NATS 1750 Lecture Notes - Lecture 3: Shield Volcano, Pyroclastic Flow, Magma Chamber
26 Oct 2016
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High pressurized and erupt more explosively as temp drops. Pulling tab off coke can and magma comes erupting up. Felsic relates to granite, melphic relates to basaltic. Rock- when rubbed using glacier: till light. Hotspot: develops under crust (currents deep in mantle) Evidence that hotpots that rifts will open. Some reason hotter than average spot in mantle than makes magma. Magma rises through crust and erupts (generated far down) Magma will rise and melt through crust. Magma chamber activity will push magma up and out. Shield volcano: long profile, and shield like shape. As they get higher and higher, magma will find a easier way to come out. Many volcanoes but coming from one hotspot (hawaii islands) Millions of years, 100 km and 8km tall. Hotspot volcanoes can be active for long periods of time. Produces that when magma runs out; plates move over hot spot. Hot spot rises through another part of crust.
