elective geography secondary 3 express (new)- plate tectonics 3
TRANSCRIPT
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Elective Geog (New)
Secondary 3 E
Week 4: Living with Tectonic Hazards
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+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
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+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
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+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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http://www.youtube.com/watch?v=ic54PSuQwLE