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Transcript
Chapter 5: Volcanoes ES 5.2 Volcanic Eruptions S Inside a Volcano S Magma Chamber: Collection of magma under volcano S Pipe: Long tube connecting chamber to surface S Vent: Opening at top (or sides) where magma leaves volcano S Lava Flow: The spread of lava on the surface S Crater: Bowl shaped feature at the top of volcano that surrounds the vent Volcanic Eruptions S When a volcano erupts, the force of the expanding gases pushes magma from the magma chamber to the pipe until it flows or explodes out of the vent. S Mt. St. Helen’s Volcanic Eruption S http://youtu.be/xP2dreOI8gI Types of Eruptions S Explosive Eruption: S High Silica Content S Thick and Sticky S This magma builds up in the pipe S This build up traps gases S Then BOOM!!! S This eruption spreads ash, cinders, and bombs! Types of Eruptions S Quiet Eruption: S Hot and/or Low Silica Magma S Thin and Runny/Flows Easily S Produce different types of Lava; creating different type of igneous rock S Hawaii was formed by Quiet Eruptions Hazards of Quiet Eruptions S Quick moving lava ran burn and bury everything in its path S Video of slow moving Lava destroying Hawaii S http://youtu.be/HpNWL CmXyTE Hazards of Explosive Eruptions S Pyroclastic Flows: A hot, quick moving cloud of ash, cinder, and bombs that moves down the side of a volcano S Video of Pyroclastic Flows: http://youtu.be/WxlRpu Ted6g Stages of Volcanoes S Active: A volcano that is erupting or showing signs of eruption in the near future S Dormant: aka Sleeping… Expected to be active in the near future S Extinct: aka Dead… Unlikely to ever erupt again. (Ex: hot spot volcanoes)
