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13 - Plate Tectonic Theory

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Information about 13 - Plate Tectonic Theory

Published on March 9, 2009

Author: ecumene

Source: slideshare.net

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What do these maps show?

 

 

Task Produce an annotated world map to show the location and distribution of earthquakes, volcanoes and fold mountains Use pages 8+9 from the Atlas You have 15 minutes

Structure You should be able to Describe the general distribution of fold mountains, volcanoes and earthquakes Explain how this distribution is related to movements at plate boundaries. Understand the processes leading to the formation of rift valleys and block mountains. Show a basic understanding of plate tectonics, describing the global pattern of plates, their structure, and be aware of plate movements - plates moving away from each other (sea floor spreading), plates moving towards each other (subduction) and plates sliding past each other.

You should be able to

Describe the general distribution of fold mountains, volcanoes and earthquakes

Explain how this distribution is related to movements at plate boundaries.

Understand the processes leading to the formation of rift valleys and block mountains.

Show a basic understanding of plate tectonics, describing the global pattern of plates, their structure, and be aware of plate movements - plates moving away from each other (sea floor spreading), plates moving towards each other (subduction) and plates sliding past each other.

The Structure of the Earth

 

Crustal Plates

Types of Crust Oceanic crust that lies under the ocean, is mainly basalt and 5-7km thick Continental crust 20-50km thick and composed mainly of granite; it makes up the large land masses – the continents Continental crust is low density and “floats” on top of the mantle whereas oceanic crust is much higher density

Oceanic crust that lies under the ocean, is mainly basalt and 5-7km thick

Continental crust 20-50km thick and composed mainly of granite; it makes up the large land masses – the continents

Continental crust is low density and “floats” on top of the mantle whereas oceanic crust is much higher density

Convection Currents

Destructive (Convergent) Plate Boundary (Margin) subduction

Constructive (Divergent) Plate Boundary (Margin) Sea floor spreading

Cross section of the Atlantic

Other Plate Boundaries - Collision India colliding with Asian subcontinent

Other Plate Boundaries - Conservative San Andreas fault California

Rift Valley and Block Mountains

 

The end result

But is it all bad?

Task Produce an A3 summary sheet to show the 4 plate boundaries (destructive, constructive, collision and conservative) You need a cross-sectional diagram of each For each boundary you should; describe what is happening, give a real example of a place in the world where this boundary can be found, outline the type of tectonic (volcanic and earthquake) activity linked with each boundary.

Produce an A3 summary sheet to show the 4 plate boundaries (destructive, constructive, collision and conservative)

You need a cross-sectional diagram of each

For each boundary you should;

describe what is happening,

give a real example of a place in the world where this boundary can be found,

outline the type of tectonic (volcanic and earthquake) activity linked with each boundary.

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