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Sea-Floor Spreading 10/3/14 7-2b pgs. 175-176  IN: List 3 pieces of evidence Wegener found to help support his theory of continental drift. Glue in the.

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Presentation on theme: "Sea-Floor Spreading 10/3/14 7-2b pgs. 175-176  IN: List 3 pieces of evidence Wegener found to help support his theory of continental drift. Glue in the."— Presentation transcript:

1 Sea-Floor Spreading 10/3/14 7-2b pgs  IN: List 3 pieces of evidence Wegener found to help support his theory of continental drift. Glue in the diagram Put your Pangaea Puzzle on the books

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3 What is Wegener’s Evidence?  Fossils of the same plant and animal species are found on both sides of the Atlantic Ocean.

4 What is Wegener’s Evidence?  Similar types of rock and evidence of the same ancient climatic conditions were found on several continents.

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6 What is Wegener’s Evidence?  Split mountain ranges.

7 More Evidence  Meteorite strike.

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10 Do you believe his theory? What is Wegener still missing?

11 Wegener could not explain What force is moving the continents? In 1930, Wegener died on a trip to Greenland.

12 In the 1950s, the ocean floor was surveyed in detail, that their full extent became known.

13 Mid-Ocean Ridges  Underwater mountain chains that run through Earth’s ocean basins.

14 Mid-Atlantic Ridge

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16 Sea-floor Spreading  The process by which new oceanic lithosphere is created as older materials are pulled away.

17 Sea-floor Spreading  Remember oceanic crust is more dense than continent crust so it sinks down.

18 Sea-floor Spreading

19 Young rocks are near the Mid-Ocean Ridge Old rocks are closer to the coastlines.

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23 Fig Evolution of a Divergent Plate Boundary

24 Magnetic Reversal  When Earth’s magnetic poles change place.

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26 Magnetic Reversals

27 OUT: Explain why Wegener’s Theory of Continental Drift was not correct.


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