Elective Geography Secondary 3 Normal Academic- Strategies to Alleviate Uneven Development 1
Elective Geography Secondary 3 Express (New)- Plate Tectonics Week 3
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Transcript of Elective Geography Secondary 3 Express (New)- Plate Tectonics Week 3
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Elective Geog (New)Secondary 3 EWeek 3: Living with Tectonic Hazards
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2+Lesson Outcomes
Students would be able to Describe the internal structure of the Earth (core,
mantle, crust) and tectonic plates. Explain the movement of plates.
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3
http://www.youtube.com/watch?v=TzzGPfVx32M
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4+
Compare your drawing with the one on page 6. Have you seen this picture before? Did you use any of the terms used in your textbook?
Draw a diagram showing the internal structure of the earth. Annotate the diagram using the terms listed below.
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5+Take note of the command words used! Draw
Make a sketch of a geographical form Include labels to the diagram Question may be written as ‘Using a diagram’ or
‘Illustrate with a sketch’
Annotate Add notes of explanation Label with short comments a diagram, map or
photograph to describe or explain If asked ‘Using only an annotated diagram…’ only the
diagram and attached notes will be marked Insert/Label Place specific names or details to an illustrative technique
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6+Internal Structure of the Earth:Core Inner core- Solid
Pressure exerted on it by surrounding layers 1,200 km thick
Outer Core- Liquid 2,100 km thick
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7+Internal Structure of the Earth:Mantle Solid rock that flows under high temperature and
pressure
Layer of solid rock and the asthenosphere In the Asthenosphere, high temperatures and
pressure bring the rocks close enough to their melting point for them to be easily deformed
Solid rock that flows?
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9+Internal Structure of the Earth:Crust Hard shell made up of thick slabs or rocks that are
constantly moving Plates
Oceanic Crust: crust beneath oceans
Continental Crust: crust beneath continents
Crust + Uppermost mantle = Lithosphere Lithosphere melts, hot molten rock known as magma
is formed
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10
http://pubs.usgs.gov/gip/dynamic/historical.html
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http://www.youtube.com/watch?v=0iW5HUrEkc8&feature=fvwrel
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13
http://www.youtube.com/watch?v=ryrXAGY1dmE
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14+Internal Structure of the Earth:Crust Hard shell made up of thick slabs or rocks that are
constantly moving Plates
Oceanic Crust: crust beneath oceans
Continental Crust: crust beneath continents
Crust + Uppermost mantle = Lithosphere Lithosphere melts, hot molten rock known as magma
is formed
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15+Internal Structure of the Earth:Plates Crust is broken into tectonic plates
Type of Crust
Location Thickness
Type and age of rock
Oceanic crust
Beneath deep oceans
Between 5 and 8km
Consists mainly of basalt, a heavy and dense rock formed from magma which has coolded quicklyRock of less than 200 million years ago
Continental crust
Beneath the earth’s continental land masses and under shallow seas close to continents
Between 30 and 60km
Consists of lighter rock, including graniteA wide range of rock ages, from very recent to nearly 4 billlion years old
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Class Discussion: Convection Currents/ Slab Pull
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Earth is made up of the core, mantle and crust.
Oceanic crust is denser than a continental crust.
Plate movement is caused by convection currents and slab- pull
force