Volcanoes & Plate Tectonics Inside Earth Chapter 3.1 Pages 88-92 What is a Volcano? A weak spot in the crust where molten material, or magma comes to the surface Volcanic Activity is a constructive force that adds new rock to existing land or forms new islands.
Volcano Menu Lava Crater Vent Volcano Erupts
Lava Flow Pipe Magma Rising Magma Magma Chamber
Magma / Lava Magma: melted rock, gases and water vapor from the mantle. Below the surface Lava: magma that reaches the surface Cools and forms solid
rock. Volcano Menu Why does Magma Rise? Magma is a liquid, so it is less dense than the solid material around it Flows upward into cracks in the rocks above
Rises until it reaches the surface or becomes trapped beneath layers or rocks. Volcano Menu Volcano Erupts Dissolved gases trapped in magma are under tremendous pressure
Eruption occurs when the gasses rush to the surface, carrying magma with them. Volcano Menu Crater Lava collects in the Crater: the bowl-shaped area that forms around the volcanos vent.
Volcano Menu Vent The point on the surface where magma and gas leave the volcanos pipe. Volcano Menu
Pipe A narrow, almost vertical crack in the crust through which magma rises to the surface. Volcano Menu Magma Chamber A large underground pocket of magma that is made from magma rising to the surface.
Volcano Menu Lava flow The river of lava that pours down a volcano over the land. Volcano Menu
Exit Pass Describe two different features of a volcano. Divergent Boundaries Form along the midocean ridge Lava pours out of the cracks in the ocean floor
Iceland is a volcano on the mid-ocean ridge that has reached the surface. Convergent Boundaries Plates collide Denser plate subducts towards the mantle. Forms a deep-ocean trench The crust melts and forms magma that rises Rising magma erupts through a volcano on the surface.
Convergent Boundaries Ocean/Ocean Denser ocean plate subducts Forms a deep sea trench Forms an island arc of volcanoes Japan New Zealand Aleutians
Convergent Boundaries Continent to Ocean Dense ocean plate subducts Forms a deep sea trench Forms volcanoes on the land Mt. St Helens
Andes Mountains in S. America Stages of a Volcano Active: A live volcano that is erupting or shows signs that it may erupt in the future Dormant: A sleeping volcano. It may awake in the future
and become Active Extinct: A dead volcano. It is unlikely to erupt again. Location of Volcanoes Most occur along diverging boundaries such as the Mid-Ocean Ridge or in subduction zones. Location of Volcanoes
About 600 active volcanoes on land, more lie beneath the sea. Ring of Fire formed by the many volcanoes that rim the Pacific Ocean. Hot Spot Volcanoes An area where magma from deep within the mantle melts through the crust like a blow torch Lie in the middle of plates
Yellowstone formed under the continent The plate travels over the hot spot Created a chain of islands to form Hawaii Hot Spot Volcanoes Exit Pass What are the 3 stages of a
volcanos life? Explain one of them. 1 Ash Cloud 7 Lava Flow
2 Crater 3 Vent Magma Chamber
6 5 Pipe 4 Sill
What to Work On Read pages 88-92 in the textbook Answer the Section 3.1 Review questions on page 91 (#s 1-4) DUE: Friday, November 4th Project Topics
Iceland Hotspots (Hawaii) San Andreas Fault
Tau Tona mine Mount St. Helens Deep-sea Vents Christchurch, Australia earthquake Magnetic stripes / field Coral reef atolls Landslides
Liquefaction Sinkholes Satellite mapping Grand Canyon
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