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Welcome to Science 9/13

Welcome to Science! Update your grade sheet for the Earth's Layers worksheet, and get ready to delve into the mysteries of Pangaea and plate tectonics. Learn about Wegener's theory of continental drift and the evidence supporting it. Explore the concept of sea-floor spreading and magnetic reversals. Get hands-on with the Pangaea lab and discover how Earth's continents have evolved over millions of years. Today's schedule includes discussions, demonstrations, and interactive learning activities. Join us on this exciting scientific exploration!

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Welcome to Science 9/13

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  1. Welcome to Science 9/13 • Update your grade sheet. For the Earth’s Layers WS if you followed directions you got 10/10. If you didn’t answer the question on the back or color the diagram you got 8/10. If you didn’t do either you got 6/10. Write down your assignments.

  2. Welcome to Science 9/15 • Turn in your Pangaea Lab. Find your seat and get your half sheet of paper out from yesterday. On your paper, answer the following questions: Do not open your book • 1. What is the title of Ch. 7 Section 2 • 2. What were the Terms to Learn for Ch. 7 Section 2? • 3. In 3-5 sentences, explain the main idea of Ch. 7 Section 2.

  3. Today's Schedule • 1. Ch. 7 Section 2 Discussion and Demonstrations. • 2. Plate Tectonics WS?

  4. Restructuring Pangaea LabQuestion of the Day • Besides the shape of the continents, what other evidence shown in the map below supports the Pangaea theory?

  5. What was Pangaea? • Has the world always looked as it does today?

  6. What was Pangaea? • Pangaea means ‘all land’ in Greek • 245 million years ago Earth’s continents were joined together to form a supercontinent known as Pangaea.

  7. Reconstructing Pagaea Lab • 1. Label the 6 continents, including Greenland, before cutting them out. • 2. When you are cutting, cut as close to the edge of the continents as possible. Don’t cut out the islands. • 3. Outline the edge of each continent with a different color. • 4. There will not be enough scissors for everyone to cut out at the same time, so if you do not have scissors do step 3 first.

  8. Ch. 7 Section 2 Restless Continents • What do we mean when we say Restless Continents? • Continental drift- theory that continents can drift apart and have done so in the past.

  9. I. Drifting Continents • Why did Alfred Wegener believe in continental drift? • 1. continents fit together like a puzzle • 2. Fossils of the same species were found on different continents • 3. evidence of rocks and climatic conditions were found on the same continents.

  10. II. Breakup of Pangaea • What did Wegener infer based on his evidence? • Millions of years ago there was one supercontinent that over time slowly broke apart

  11. III. Wegener’s Theory Rejected • Why? • Wegener could not conclude how or why the continents moved. • What discovery provided clues that Wegener was right?

  12. III. Mid-Ocean Ridge • 1960’s underwater worldwide mountain chain was discovered • What happens at the mid-ocean ridge that moves the continents? • Sea-floor spreading

  13. III. What is sea-floor spreading? • As plates diverge magma rises up to form a mid-ocean ridge. As more magma continues to rise and harden it spreads the sea-floor apart

  14. III. Evidence of Sea-floor Spreading • How do we know sea-floor spreading is happening? Seafloor Spreading Interactive • Rock samples taken from the sea-floor show that the oldest rocks are further from mid-ocean ridges.

  15. IV. Magnetic Reversals • Throughout history Earth’s magnetic fields will switch. Meaning the north pole goes to the south pole and vice versa. • Magnetic minerals in magma align with Earth’s magnetic field. When the poles switch this creates stripes or bands that can be seen on the sea-floor.

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