Download Cornell Notes Topic/Objective: The Theory of Plate Tectonics Name

Cornell Notes
Topic/Objective: The Theory of Plate Tectonics
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Essential Question: What is the theory of plate tectonics? What are the three types of plate boundaries?
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plate tectonics -
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_______________suggests that Earth’s surface is divided into large ___________ of
rigid rock and each plate ____________ over Earth’s hot and semi plastic mantle.
In the 1940s scientists determined the depth of the ocean using an echo sounder.
mid-ocean ridges-
Seafloor spreading –
In your own words describe what plate tectonics is?
Divergent plate boundary -
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When the ___________ spreads at a mid-ocean ridge, lava erupts, cools, and forms
new ___________.
_____________ plate boundaries can also exist in the middle of a continent, where
they ___________ continents apart and form rift valleys.
Divergent Boundary Diagram
Transform plate boundary -
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As they move past one another, the plates can get stuck and stop moving.
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Transform Plate Boundary Diagram
Convergent plate boundariesSubduction-
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When an __________ plate and a ____________ plate collide, the denser oceanic
plate subducts under the edge of the continent, creating a deep ______________
and a line of _______________ above the subducting plate on the edge of the
continent.
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When two ______________ plates collide, neither plate is subducted, and
_______________ form from uplifted rock.
Convergent continental oceanic plate boundary Diagram
What are three types of plate boundaries?
Evidence for Plate Tectonics
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_____________ form where plates separate along a mid-ocean ridge or continental
rift or collide along a subduction zone.
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Earth’s plates move because the asthenosphere moves underneath the lithosphere.
Convection –
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Convection currents in the asthenosphere act like a conveyor belt _______________
the lithosphere above it.
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