Below is a diagram of the Mid-Atlantic Ridge on the ocean floor.
Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean...
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Transcript of Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean...
![Page 1: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/1.jpg)
Sea Floor SpreadingChapter 4.4
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• What is the mid-ocean ridge?
• What do we use to map the mid-ocean ridge?
• The mid-ocean ridge is the longest chain of mountains in the world.
• The mid-ocean ridge is mapped using Sonar.
![Page 3: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/3.jpg)
![Page 4: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/4.jpg)
• What idea did Harry Hess propose?
• Harry Hess proposed that ocean floors move like conveyer belts, carrying the continents along with them. This movement begins at the mid-ocean ridge called Sea Floor spreading.
![Page 5: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/5.jpg)
• How does this movement at the mid-ocean ridge begin?
• At the mid-ocean ridge, molten material rises from the mantle and erupts. The molten material then spreads out, pushing older rock to both sides of the ridge.
![Page 6: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/6.jpg)
![Page 7: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/7.jpg)
![Page 8: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/8.jpg)
• What types of evidence support the theory of sea-floor spreading?
Three Types of Evidences:
1. Evidence from Molten Material
![Page 9: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/9.jpg)
• How does magnetic stripes support the theory of Sea floor spreading?
2. Evidence from Magnetic Stripes
![Page 10: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/10.jpg)
In Order to understand Magnetic Stripes lets talk
about the Earth’s magnetic North!
Presented by Ms. Macris and Ms. Burke from UCLA
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What exactly is the North Pole?
![Page 12: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/12.jpg)
The Earth acts like a giant magnet because of it’s metallic core!
![Page 13: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/13.jpg)
Sometimes the magnet flips over!
Magnetic reversal video
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How the seafloor got it’s stripes!
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• Drilling Samples
• Evidence of Sea floor spreading video
3. Evidence from Drilling SamplesYoungest rock was found in the center and older further away.
![Page 19: Sea Floor Spreading Chapter 4.4. What is the mid-ocean ridge? What do we use to map the mid-ocean ridge? The mid-ocean ridge is the longest chain of mountains.](https://reader036.fdocuments.us/reader036/viewer/2022081504/56649d755503460f94a55f5e/html5/thumbnails/19.jpg)
• What is subduction?
• Subduction is the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle.
• animation of subduction • another animation of plate tectonics
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Subduction
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• What is created where subduction occurs?
• The ocean floor plunges into deep underwater canyons called deep-ocean trenches.
• Deep Ocean Trench
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How does this help explain Wagner’s idea of continental drift?
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• Why doesn’t the ocean floor keep getting wider?
• The Pacific Ocean is getting smaller and the Atlantic Ocean is getting bigger.
• Bill Nye sea floor spreading video