plate tectonics pk
TRANSCRIPT
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Plate TectonicsPlate TectonicsEvolution of the Earth
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VolcanoesVolcanoes• Volcanoes are the result of hot spots
within the crust or mantle of the earth.
• The hot, liquid rock will break through weak spots in the surface and form volcanoes or flood basalts.
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Some eruptions are quiet with very fluid (low viscosity) lava flows
…while others are explosive
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Many volcanoes do not release lava, instead they spit ash and small bits of lava called lapilli.
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VolcanoesVolcanoes
Mt. St. Helen before the explosive eruption
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VolcanoesVolcanoesTime lapse of the eruption
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VolcanoesVolcanoes
Mt. St. Helen after the eruption
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Volcano locationsVolcano locations
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EarthquakesEarthquakes
• Earthquakes are a result of motion within the earth.
• This only occurs where the earth is solid and therefore can only occur within about 100 miles of the surface
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EarthquakesEarthquakes
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EarthquakesEarthquakes
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EarthquakesEarthquakes
Earthquakes can cause Tsunamis
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EarthquakesEarthquakes
Location of worldwide earthquakes
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Tectonic PlatesTectonic Plates
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Tectonic PlatesTectonic PlatesVolcanoes
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Tectonic PlatesTectonic Plates
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Plate BoundariesPlate Boundaries• Convergent – plates move toward
one another
• Divergent – plates move away from each other
• Transform – plate moves sideways from each other
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Convergent PlatesConvergent Plates
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Divergent PlatesDivergent Plates
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Transform PlatesTransform Plates
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Mid-Plate HotspotsMid-Plate Hotspots
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Why do the Plates Move?Why do the Plates Move?
No single idea explains everything but we can identify several forces that contribute to the movement of the plates.
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The Big PictureThe Big Picture
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PangaeaPangaea
The break up of Pangaea
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Where are we going?Where are we going?
We appear to be headed for another super continent as North America,
South America, Asia and Australia converge in the ever shrinking Pacific Ocean