plate boundaries. types of crust continental crust less dense granite oceanic crust more dense...
TRANSCRIPT
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Plate Boundaries
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Types of Crust• Continental Crust• Less dense granite
• Oceanic Crust• More dense basalt
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Divergent Boundaries• Two plates move apart (diverge from each other). • New crust is formed from magma.
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• Underwater• Mid ocean ridges.• Seafloor Spreading.• EX: Mid Atlantic Ridge
• On Land• Rift Valleys.• EX: African Rift Valley, New Madrid Fault System
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Mid Ocean Ridge
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Mid Atlantic Ridge
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Rift Valley
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Convergent Plate Boundaries• Plates come together (converge)• The denser plate (Oceanic Crust) sinks while the less dense
plate (Continental Crust) rises.• 3 types of collisions….
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• Continental colliding with oceanic. • A Zone of Subduction occurs, the denser plate is forced
underneath the less dense plate and melts. • Volcanoes and Trenches.• Possible earthquakes and tsunamis.• EX: Mt. St. Hellens
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Oceanic/Continental Convergence
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• Oceanic colliding with oceanic.• Subduction • Volcanoes, trenches, and island arcs.• EX: Mariana Trench and Alaskan islands• Possible earthquakes and tsunamis
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Oceanic/Oceanic Convergence
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• Continental plates colliding with continental plates.• Mountain range• EX: Himalayan Mountains
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Continental/Continental Convergence
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Transform Boundaries• Two plates move past each other in opposite directions.• Faults lines and earthquakes. • EX: San Andreas Fault
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Transform Boundary
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Hot Spots• Volcanic activity that does not occur on plate boundaries
occurs at hot spots. • Magma shoots up through the lithosphere. • Hot Spots are in fixed locations, as the lithospheric plates
move over them. • EX Yellow Stone National Park and Hawaii
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Tsunami• A series of long waves that travel across the oceans at very
fast speeds.• Caused by Earthquakes which vertically move the sea floor
(zones of subduction).
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Geysers and Ocean Vents• A geyser is a vent on Earth’s surface that periodically shoots
out hot water. • An ocean vent is a vent underwater which releases heat,
warming the water around it.• Both are caused by volcanoes!