structure of the earth & plate tectonics. our changing earth the surface of the earth is always...
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Structure of the Earth&
Plate Tectonics
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Our Changing Earth
The surface of the earth is always changing.
What are the two ways in which landform change on the surface?
Weathering Erosion
The landform also change due to the movement ofthe plates.
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Internal Structure of the Earth
The internal structures
of the earth are Inner core Outer core Mantle Crust
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Crust
Which structure of
the earth do we live
on? Crust
The crust is made of
pieces called plates, and it is not hot.
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Crust
The crust has cracks, and these cracks are known as faults.
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Crust
Each separate part of the crust is called a plate – a tectonic plate.
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Mantle
These plates float on a layer of liquid rock called the mantle.
The plates move around slowly on top of the mantle.
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Inner and Outer Core
The center of the earth is a metal core and it is broken into two parts, the inner and the outer core.
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Depth and Temperature
Structure of the Earth
Depth Temperature
Mantle 2900 Km 870°C
Outer core 5150 Km 4400-6100°C
Inner core 6400 Km 7000°C
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Plate Tectonics
Earth’s crust are broken into enormous slabs called tectonic plates.
About 200 million years ago, a giant landmass existed called pangaea.
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Pangea Movement
http://www.geo.wvu.edu/~donovan/geol101/animations/47.swf
http://www.classzone.com/books/earth_science/terc/content/visualizations/es0806/es0806page01.cfm?chapter_no=visualization
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Plate tectonics
Slow movement of liquid rock in the mantle causes the tectonic plates to move.
http://education.sdsc.edu/optiputer/flash/convection.htm
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Plate Tectonics
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Tectonic Plates and Earth’s Active volcanoes
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Where are most of the volcanoes
located?
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What is a Volcano?
Volcano is an opening or a vent in the surface of the earth through which magma and gases escape.
Magma is molten rock located beneath the surface of the earth.
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Volcano Erupting
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Earthquakes
http://www.classzone.com/books/earth_science/terc/content/visualizations/es1002/es1002page01.cfm?chapter_no=visualization
http://www.pbs.org/wnet/savageearth/animations/earthquakes/index.html
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Earthquakes
What causes earthquake? When plates rub together along their faults
lines (the places where they meet). Most earthquakes begin deep within the
Earth’s surface.
http://news.bbc.co.uk/2/hi/science/nature/4126809.stm
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Earthquakes
The amount of energy released by an earthquake is called its magnitude.
When an earthquake occurs at the sea floor, it is called tsunami.
http://news.bbc.co.uk/2/hi/asia-pacific/5194316.stm
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Resources
http://csep10.phys.utk.edu/astr161/lect/earth/tectonics.htmlhttp://www.stvincent.ac.uk/Resources/EarthSci/Tectonics/move.htmlhttp://geobytesgcse.blogspot.com/2007/01/plates-and-convection-currents.htmlhttp://www.globalchange.umich.edu/globalchange1/current/lectures/evolving_earth/evolving_earth.htmlhttp://www.mrsciguy.com/eq.html