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Transcript of Warm-Up Find the mistakes! 1. During the 1940s and 1950s, scientists began using radar on moving...
![Page 1: Warm-Up Find the mistakes! 1. During the 1940s and 1950s, scientists began using radar on moving ships to map large areas of the ocean floor in detail.](https://reader033.fdocuments.in/reader033/viewer/2022051000/56649ec95503460f94bd668b/html5/thumbnails/1.jpg)
Warm-UpFind the mistakes!
Warm-UpFind the mistakes!
1. During the 1940s and 1950s, scientists began using radar on moving ships to map large areas of the ocean floor in detail.
2. The youngest rocks are found far from the mid-ocean ridges.
3. The scientist Harry Henry Hess invented echo-sounding devices for mapping the ocean floor.
4. As the seafloor spreads apart, hot saltwater moves upward and flows from the cracks.
5. Rocks on the seafloor are much older than many continental rocks.
1. During the 1940s and 1950s, scientists began using radar on moving ships to map large areas of the ocean floor in detail.
2. The youngest rocks are found far from the mid-ocean ridges.
3. The scientist Harry Henry Hess invented echo-sounding devices for mapping the ocean floor.
4. As the seafloor spreads apart, hot saltwater moves upward and flows from the cracks.
5. Rocks on the seafloor are much older than many continental rocks.
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PLATETECTONICS
PLATETECTONICS
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Theory of Plate TectonicsTheory of Plate Tectonics
Earth’s crust and part of the upper mantle are broken into sections.
These sections are called plates.
Plates move on the asthenosphere: a plastic-like layer of the mantle.
Earth’s crust and part of the upper mantle are broken into sections.
These sections are called plates.
Plates move on the asthenosphere: a plastic-like layer of the mantle.
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Earth’s StructureEarth’s Structure
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Earth’s Crust & MantleEarth’s Crust & MantlePlates are made up of the crust and a
part of the upper mantle:
Lithosphere- Rigid. Made up of crust and upper mantle. 0-100 km thick.
Asthenosphere- The plastic-like layer that lies below the lithosphere.
The plates of the lithosphere float on the asthenosphere.
Plates are made up of the crust and a part of the upper mantle:
Lithosphere- Rigid. Made up of crust and upper mantle. 0-100 km thick.
Asthenosphere- The plastic-like layer that lies below the lithosphere.
The plates of the lithosphere float on the asthenosphere.
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DivergentDivergentPlates are
moving apart from each other
Creates new seafloor and expanding oceans
Plates are moving apart from each other
Creates new seafloor and expanding oceans
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As continental plates separate, they create a rift valley
As oceanic plates separate and magma rises, ridges form
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Mid Ocean RidgeMid Ocean Ridge
North American Plate
Eurasian Plate
South American Plate
African Plate
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Convergent Convergent
Plates move together
There are two things that can happen at a convergent plate boundary…
Plates move together
There are two things that can happen at a convergent plate boundary…
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Oceanic - ContinentalOceanic - Continental At sites where oceanic
and continental plates collide, subduction zones form.
At subduction zones, the more dense plate (oceanic) sinks beneath the less dense plate (continental).
At sites where oceanic and continental plates collide, subduction zones form.
At subduction zones, the more dense plate (oceanic) sinks beneath the less dense plate (continental). The sinking plate melts
and forms magma that rises to the surface through a volcano.
Mountains and deep sea trenches are also found at subduction zones.
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The Andes Mountain Range is found in Chile.
The Andes Mountain Range is found in Chile.
The volcanism of the Andes Range is a result of the subduction of the Nazca Plate underneath the South American Plate.
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Continental - ContinentalContinental - ContinentalAs continental plates collide, mountain
ranges are created.As continental plates collide, mountain
ranges are created.
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The Himalayas are still forming as the Eurasian and Indian Plates collide.
The Himalayas are still forming as the Eurasian and Indian Plates collide.
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TransformTransform
Plates slide past each other
As one plate slips past another suddenly, earthquakes occur.
Plates slide past each other
As one plate slips past another suddenly, earthquakes occur.
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San Andreas FaultSan Andreas FaultLocated in
CaliforniaThe Pacific Plate
is sliding past the North American Plate
Located in California
The Pacific Plate is sliding past the North American Plate
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On the split screen NotesOn the split screen Notes
Draw a picture of the Earth’s Layer- Label and explain a convection current
Draw a picture of the Earth’s Layer- Label and explain a convection current
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Why Do The Plates Move?Why Do The Plates Move?The transfer of heat inside the Earth
provides the energy to move plates and, subsequently, many of Earth’s surface features.
Convection currents inside the mantle causes the movement of the plates
The transfer of heat inside the Earth provides the energy to move plates and, subsequently, many of Earth’s surface features.
Convection currents inside the mantle causes the movement of the plates
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Convection CurrentsConvection Currents
The Earth’s hot, inner core heats the liquid mantle.
The magma closest to the core heats up, becomes less dense, and rises.
The magma at the top of the mantle cools, becomes more dense, and sinks.
The Earth’s hot, inner core heats the liquid mantle.
The magma closest to the core heats up, becomes less dense, and rises.
The magma at the top of the mantle cools, becomes more dense, and sinks.
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Graphic organizer Graphic organizer
Create a three flap flip chart In the front of each flap write the name of a
type of boundary: Transform, Divergent, Convergent boundaries
Draw and color the boundaries on the inside of the front flap
Use your book and notes to write the following information under each flap: What happens at this type of boundary What types of geographic formations does it create Where in the world can this boundary be found
Create a three flap flip chart In the front of each flap write the name of a
type of boundary: Transform, Divergent, Convergent boundaries
Draw and color the boundaries on the inside of the front flap
Use your book and notes to write the following information under each flap: What happens at this type of boundary What types of geographic formations does it create Where in the world can this boundary be found