elective geography secondary 3 normal academic (new)- plate tectonics 2

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Elective Geog (New)Secondary 3 NWeek 4: Living with Tectonic Hazards

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3+Feedback:

http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=80058

Not a Natural Hazard

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4+Feedback:Natural Hazards Definition

Naturally occurring event that threatens human lives and causes damage to property

Tectonic Natural Hazard Caused by plate movements when continental crusts

and ocean floors move Eg. Earthquakes, volcanic eruptions and tsunamis

Climate Related Natural Hazard Caused by severe and extreme weather and climate

conditions Eg. Drought, tropical cyclones and floodsHighlight text on pg 5 of TB

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5+How good are you with maps?

Refer to page 5 of your textbook

Using the map at the back of your textbook, identify locations of natural hazards and write them into the textbook.

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Natural Hazards occur everywhere.

Some areas may be more prone to Natural Hazards.

Impact of Natural Hazards depend on the where these Natural Hazards

occur.

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Elective Geog (New)Secondary 3 NWeek 4: Living with Tectonic Hazards

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8+Lesson Outcomes

By the end of the lesson, we will 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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http://www.youtube.com/watch?v=nX2XHw-NB_w

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Class Discussion

No Textbooks!

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http://www.youtube.com/watch?v=TzzGPfVx32M

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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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13+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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14+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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15+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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17+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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Elective Geog (New)Secondary 3 NWeek 5: Living with Tectonic Hazards

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19+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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http://www.youtube.com/watch?v=ryrXAGY1dmE

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Class Discussion: Convection Currents/ Slab Pull

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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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25+Worksheet 1.1:Tips and Tricks Question 1

Must use information from the question

Question 2 Summarize figure 1.8 on pg 8 3 main points

Question 3 Too easy to give hints

Question 4 For the brave: Not taught yet, but can try

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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