plateboundaries

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Plate Tectonics:

Plate Tectonics Tectonics NOTES page 6 ©Mark Place, 2009-2010 www.LearnEarthScience.com

What is the Theory of Continental Drift?:

What is the Theory of Continental Drift?

What is the Theory of Continental Drift?:

What is the Theory of Continental Drift? Alfred Wegner, 1915 The continents were once a super-continent called Pangea the continents are plowing through the ocean floors---most people didn’t believe this

What evidence supports this theory? :

What evidence supports this theory? Africa & South America look like they fit together similar fossils, rocks, and glacial striations

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What is the Theory of Plate Tectonics?:

What is the Theory of Plate Tectonics? Earth's crust is made up of plates that ride on top of the asthenosphere The plates move due to convection currents in the mantle

What evidence supports this theory? :

What evidence supports this theory? distribution of earthquakes and volcanoes sea-floor spreading

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ESRTs Page 5

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How do oceanic and continental crust compare with regard to thickness and density?:

How do oceanic and continental crust compare with regard to thickness and density? continental oceanic Density (ESRTs pg 10) thickness high low thin thick

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What are the primary rocks which make up the continental and oceanic crusts?:

What are the primary rocks which make up the continental and oceanic crusts? continental crust oceanic crust basalt granite High density, dark- colored, fine-grained, mafic igneous rock Low-density, light- colored, coarse- grained, felsic, igneous rock

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What are these types of plate boundaries? :

What are these types of plate boundaries? What are the key characteristics for each? Give an example of where each can be found.

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Peru-Chile Trench oceanic-continental convergent boundary trenches, volcanoes, deep earthquakes

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continental-continental convergent boundary Himalayas mountain building

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transform fault San Andreas Fault slide past one another shallow earthquakes

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divergent plate boundary Mid-Atlantic Ridge new crust is made

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What happens to the age of oceanic crust as distance increases from a ridge?:

What happens to the age of oceanic crust as distance increases from a ridge?

Explain how magnetic data can be used to show that oceanic crust is diverging at ridges. Use the diagram below to help explain your answer.:

Explain how magnetic data can be used to show that oceanic crust is diverging at ridges. Use the diagram below to help explain your answer. as new crust is made at ridges, the ferrous minerals (Fe) align according to where the magnetic poles are located same pattern on opposite sides of the ridge proves sea-floor spreading

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