Transcript Earth`s Landforms

Earth’s Landforms
What are Earth’s landforms?
Lesson Essential Question
How was Earth shaped
and reshaped over time?
Landform
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shapes of land
Major landforms= plains, mountains,
hills (came to be through forces of
nature)
Plate tectonics
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large slow moving slabs or plates
Continental Drift
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Forces within Earth caused Pangaea
to break up into continental plates
and drift apart
EARTH
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Major Plates
Big Idea
What has created physical
patterns on Earth’s
surface?
Plate tectonics theory
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Earth’s surface is made up of slow
moving slabs or plates
Continents and ocean floors form the
top of these plates=move and carry
continents and ocean floors with
them
Pangaea
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Scientists believe long ago Earth was
one large supercontinent known as
Pangaea
Pangaea
Scientist claim forces within Earth
caused Pangaea to break into
continental plates and drift apart =
continental drift
Before and After
Your Turn
Think-Pair-Share
Which theory do you support?
Why
Share Out!
Analyze the Diagram page 21
Which of the present-day
continents was at one time
joined to the east side of South
America?
Earth
Outer layer= surface=crust
10-25 miles thick
Mantle
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1800 miles below the surface
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Hot rock like materials
Outer Core
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1400 miles thick
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Iron and nickel in the liquid state
Inner Core
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iron and nickel in the solid state
Rocky Mountains
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extreme heat from core causes
mantle to create pressure on crust
forcing crust to rise
pushing large blocks of rock upward
mountains, plateaus
Rocky Mountains
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Oh, Beautiful…
Himalayas
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plates push together
edges may crumble and fold
creating mountains (most highest)
Himalayas
Breathtaking!
Cascade Mountains
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2 plates collide
One moves up over the other
Homework
Take notes Shaping Earth’s
Surface pages 23-24
How are volcanoes formed?
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When 2 of Earth’s plates push
against each other, the edge of one
slides beneath the other
Heat within the mantle melts=
magma
Volcanoes
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lava is the name of magma that has
escaped onto the surface
openings through which lava flows
are volcanoes
Activating Strategy
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Write 1 haiku about
volcanoes
Write 1 haiku about
‘shaping Earth’s surface’
Haiku
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to twist out of shape (5)
people can twist, wrench
or bend (7 syllables)
very twisty too (5syllables)
Homework
September 26
Questions 1-4 page 25 in
complete sentences