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Today’s Agenda…
Bellringer: What are compression, tension, and shearing? Use your notes on Earth’s plates.
Quiz Notes on Volcanoes Homework
Volcanoes
Study Pack #5
Today’s Goals…
I can explain how different types of volcanoes form.
I can describe how a volcanic eruption occurs. I can describe the stages of a volcano.
What are volcanoes?
Weak spots in the crust where magma comes to surface, cools, and becomes cone-shaped layers of rock
Where are volcanoes located?
600 active volcanoes on land Many more beneath the sea Volcanoes occur in belts that extend across
continents and oceansRing of Fire formed by many volcanoes that circle the
Pacific Ocean
Ring Of Fire
Where are volcanoes located?
Volcanic belts are found along the plate boundariesMostly divergent plate boundaries or convergent plate
boundaries where subduction occurs Some volcanoes also occur at hot spots
An area where magma melts through the crust
Types of Volcanoes
Cinder-Cone Composite Shield
Cinder Cone
Steep, cone-shaped hill or mountain Lava piles up and hardens
Cinder Cone
Sunset Crater, Arizona
Composite
Form at convergent plate boundaries where one plate is pushed (or subducted) under another plate
Magma is forced up through many cracks in the crust
Sometimes explosive
Composite
Mount St. Helens, Washington
Shield
Often form underwater at divergent plate boundaries
Can also form over hot spotsLead to the formation of the Hawaiian Islands
Shield
Kilauea, Hawaii
Inside a Volcano
Page 302 Magma flows from the magma chamber up the
pipe Magma flows out of the vents and becomes lava Lava often collects in the crater and then flows
down the slope Lava hardens to form rock (igneous rock)
Stages of Volcanoes
Active – a volcano that is erupting or may erupt in the future
Dormant – a volcano that is “sleeping” but may erupt in the future
Extinct – a “dead” volcano that is unlikely to erupt again
Homework Journey Through a Volcano Writing
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