8/26-8/27 Chapter 1, Pgs. 50-55 Most of this is NOT in your book!
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Transcript of 8/26-8/27 Chapter 1, Pgs. 50-55 Most of this is NOT in your book!
![Page 1: 8/26-8/27 Chapter 1, Pgs. 50-55 Most of this is NOT in your book!](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649ea95503460f94bacbc9/html5/thumbnails/1.jpg)
8/26-8/27
Chapter 1, Pgs. 50-55
Most of this is NOT in your book!
![Page 2: 8/26-8/27 Chapter 1, Pgs. 50-55 Most of this is NOT in your book!](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649ea95503460f94bacbc9/html5/thumbnails/2.jpg)
May the force be
within the Earth!
![Page 3: 8/26-8/27 Chapter 1, Pgs. 50-55 Most of this is NOT in your book!](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649ea95503460f94bacbc9/html5/thumbnails/3.jpg)
Q: What is geology?
A: The study of the earth’s physical structure and history.
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What does the inside of the earth look like?
1.Core: Consists of very hot metal, mainly iron mixed with some nickel. Inner
core is thought to be dense and solid. Outer core is
molten or liquid.
2. Mantle: A thick layer of rock. About 1800 miles thick.
Contains pockets of magma or melted rock.
![Page 5: 8/26-8/27 Chapter 1, Pgs. 50-55 Most of this is NOT in your book!](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649ea95503460f94bacbc9/html5/thumbnails/5.jpg)
3.Crust: Rocky surface layer. Like frosting on a cake. 5 to 22
miles thick. Natural forces interact with and affect the
earth’s crust, creating landforms.
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Q: How much of the earth is water?
A: 70% of earth is covered with water.
Four Major Types of Landforms:
Mountains
Hills
Plateaus
Plains
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Landforms are shaped by the internal forces that originate in the earth’s interior:
1.Volcanism
2. Earthquakes
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Volcanism – movement of magma inside the earth, when molten rock (lava) inside the earth breaks through the earth’s crust it forms a volcano
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Earthquake – movement of rock layers that bend or break the earth’s crust. Folds and faults occur.
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![Page 11: 8/26-8/27 Chapter 1, Pgs. 50-55 Most of this is NOT in your book!](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649ea95503460f94bacbc9/html5/thumbnails/11.jpg)
Q: How do we explain these folds/faults?
A: The Plate Tectonics THEORY:
The earth’s outer shell (mantle and crust) is composed of large plates whose slow and steady
movement explains earthquakes and volcanic activity.
![Page 12: 8/26-8/27 Chapter 1, Pgs. 50-55 Most of this is NOT in your book!](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649ea95503460f94bacbc9/html5/thumbnails/12.jpg)
The Plate Tectonics Theory is based in two other theories…
Continental Drift Theory and the Seafloor Spreading Theory.
Continental Drift Theory: Theory proposed by Alfred Wegener in 1912, where he suggested the idea that over- - - - - - - - - - - >
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![Page 14: 8/26-8/27 Chapter 1, Pgs. 50-55 Most of this is NOT in your book!](https://reader036.fdocuments.in/reader036/viewer/2022070410/56649ea95503460f94bacbc9/html5/thumbnails/14.jpg)
Pacific Ocean – Ring of Fire• Humans encounter tectonic
forces most directly as earthquakes and volcanoes
• Volcanoes and earthquakes are particularly common around the edges of the Pacific Ocean
• Area is known as the Ring of Fire
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Four Major Types of Plate Movement
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1. Subduction: Oceanic plate goes under a continental plate.
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2. Converging: Two continental plates meet each other creating mountains.
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3. Faulting: Plates moving past each other creating earthquakes.
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4. Seafloor Spreading: The ocean floor is not flat. Molten rock (magma) from the mantle rises up to the underwater ridges and breaks through a split at the top of the ridge - called a rift valley. Example: Mid-Atlantic Ridge
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Sea-Floor Spreading
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http://www.worldatlas.com/aatlas/infopage/tectonic.htm
Plate Tectonics MapAssignment