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PLATE TECTONICS

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Page 1: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

PLATE TECTONICS

Page 2: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

Lithospheric plates

• Lithosphere is made up of 12 large plates and about 20 smaller ones

• Plates are solid and float on the asthenosphere

• Convection currents in the asthenosphere make the plates move

Page 3: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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Page 4: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

Continental and Oceanic plates

• Continental plates are usually less dense

• Oceanic plates are under the ocean and made of more dense rock

Page 5: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

Plate Boundaries

There are 3 main types of plate boundaries:

• Divergent ( moving apart)

• Convergent (moving together)

• Transform (moving past each other)

Page 6: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

Divergent Boundaries

• On land - produce rift valleys

• Under the ocean - mid-ocean ridges such as in the Atlantic

• As the plates separate, magma rises into the space and hardens

• Volcanoes and shallow earthquakes occur

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Page 7: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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Page 8: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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Page 9: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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Page 10: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

Convergent boundaries

• One plate may move under the other (subduction zone)

• Deep earthquakes and volcanoes occur

• Mountains form when one plate is pushed up

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Page 11: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

Types of convergent boundaries

• Oceanic - oceanic: creates chains of islands (ex. Phillipines)

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Page 12: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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Page 13: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

• Oceanic - continental: oceanic plate subduct under continental plate; creates deep ocean trenches and coastal mountain ranges

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Page 14: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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Page 15: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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Page 16: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

• Continental - continental: mountain ranges ex. Himalaya

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Page 17: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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Page 18: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

Transform boundaries

• Plates slide past each other causing fault lines and earthquakes

• Ex. San Andreas Fault

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Page 19: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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Page 20: PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere

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