elective geography secondary 3 express (new)- plate tectonics 3

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Elective Geog (New)

Secondary 3 E

Week 4: Living with Tectonic Hazards

+Lesson Outcomes

By the end of the lesson, we will be able to describe the global distribution of tectonic plates and

types of plate boundaries.

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+Jig Saw Puzzle

Each envelope contains a cut out world map

which shows the names of plates and their

boundaries.

In your groups, try to piece together your

jigsaw pieces and stick it onto a piece of

paper.

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How would you describe the pieces of the

jigsaw?

What do the lines represent?

Which continent do we live in?

What observations can you make about the

plate and the related continent that we live

in?

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+Important Note!

Plates are NOT continents

Plates include both continental and oceanic

crust.

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+Types of Plate Boundaries

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+Different types of plate boundaries

Divergent: where plates move away from

each other

Convergent: where plates move towards

each other

Transform: where plates move past each

other

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+Note areas with earthquakes &

volcanic activities

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+Handout: KQ1 SH3a

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+Divergent Plates

Areas where two plates move away from

each other

Magma moves upward to the surface where

it cools to form new oceanic crust along

these boundaries Oceanic-oceanic

Continental-continental

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+Oceanic-oceanic

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Magma rises from the mantle to fill the gap

between the plates as they diverge.

New sea floor is formed when the magma

cools and solidifies. This process is called

sea-floor spreading.

Magma rises at the zone of

divergence/spreading zone to form a ridge of

new ocean floor called mid-oceanic ridge.

The newly formed (youngest) rocks are

closest to the middle of the ridge/plate

boundaries.

At various points along the ridge, magma

builds up above the ocean to form volcanic

islands.

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+Oceanic-oceanic

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+Complete the following:

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+Continental-continental

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+

Elective Geog (New)

Secondary 3 E

Week 4: Living with Tectonic Hazards

+Recall

Types of Plate Boundaries?

What must you remember? Drawing

Direction of Plate Movement

Plates Involved

Resulting Landform

Example

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armanalluwie.blogspot.com

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+Continental-continental

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How to draw? Pg 23

+Rift valleys and Block mountains

A fault Fracture in the rocks along which the rocks are displaced

Rift Valley Is a valley with steep sides that is formed when the sections

of the crust extend along fault lines

Block Mountain A block of land with steep sides

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+Afar Triangle,

Triple Divergent Triangle

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armanalluwie.blogspot.com

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armanalluwie.blogspot.com

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http://www.youtube.com/watch?v=ic54PSuQwLE