Plate Tectonics. Wilson- combined Continental Drift, Sea- Floor Spreading. A geologic theory that...
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Transcript of Plate Tectonics. Wilson- combined Continental Drift, Sea- Floor Spreading. A geologic theory that...
![Page 1: Plate Tectonics. Wilson- combined Continental Drift, Sea- Floor Spreading. A geologic theory that states that pieces of Earth’s lithosphere are in constant,](https://reader035.fdocuments.us/reader035/viewer/2022062409/5697c0281a28abf838cd6d31/html5/thumbnails/1.jpg)
PlatePlateTectonicsTectonics
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• Wilson- combined Continental Drift, Sea-Floor Spreading.
• A geologic theory that states that pieces of Earth’s lithosphere are in constant, slow motion driven by convection currents in the mantle.
Plate Tectonics
CD RiftEvidence
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Earth’s Plates
CD RiftEvidence
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ClimateConvergent Boundaries
• Definition: Two plates move towards each other. (Collision Boundary)
• Other Info: – Density plays a role.– Effect on Crust:
• Cont/Cont Collision creates mountains• Subduction- destroys ocean crust.
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• Geologic Features:– Cont/Cont- Forms Mountains- • Himalayas
Convergent Boundaries
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• Geologic Features:– Ocean/Ocean (Subduction boundary)• Denser Ocean plate subducts.
– Deep sea-trenches, Volcanic Island Arc
– Cont/Ocean (Subduction boundary)• Denser Ocean plate subducts.
– Deep sea-trenches, Volcanoes (Mt. St. Helens)
Convergent Boundaries
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• Definition- Two plates pull apart.• Motion:
• Geologic Features- Forms a rift valley.• Other Info- – Great Rift Valley– Mid-Ocean Ridge
ClimateDivergent Boundaries
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• Geologic Features- – Forms a rift valley.• Chain of volcanoes
– Creates new ocean floor.
• Other Info- – Great Rift Valley– Mid-Ocean Ridge
Divergent Boundaries
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• Two plates slide past each other in opposite directions.
• Motion of Plates:
• Geologic Features: – Faults- break in crust
• Other Info: – San Andreas Fault– Causes Earthquakes
ClimateTransform Boundaries
Pacific Plate
North American
Plate
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ClimateBoundary Diagrams
• Boundary: – Transform
• Examples: – San Andres Fault
• Motion: – slide past each other.
• Features formed: – Fault
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• Boundary: – Divergent
• Example: – Mid-Atlantic Ridge
• Motion: – Pull apart, move away
• Features formed: – Mid-Ocean Ridge
• Underwater Volcanoes
Boundary DiagramsBoundary Diagrams
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ClimateBoundary Diagrams
• Boundary: Divergent
• Example: Great Rift Valley
• Motion: Pull apart, move away
• Features formed: Rift Valley
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Divergent Boundary
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ClimateBoundary Diagrams
• Boundary: Convergent
• Examples: Himalaya, Mts.
• Motion: Towards each other
• Features formed: Mt. Ranges
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ClimateBoundary Diagrams
• Boundary: Convergent
• Examples: – Japan.– Aleutian Islands
• Motion: – Towards each other
• Features formed: – Subduction, Trench, Volcanic island arc
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ClimateBoundary Diagrams
• Boundary: Convergent
• Examples: – Mt. St. Helens
• Motion: – Towards each other
• Features formed: – Subduction, Trench, Volcanoes