Continental Drift Alfred Wegner’s theory

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Mr. Russo Beaumont High School

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Presentation transcript:

Continental Drift Alfred Wegner’s theory

What was Wegner’s Theory? The continents moved

What was his evidence? Jigsaw puzzle fit of the continents Matching rocks & mountain chains Similar fossils on different continents A single glacier covering several continents Paleomagnetism (continents aligned in different directions, not northward)

Theory of Plate Tectonics Crust is made of 12 moveable lithospheric plates sitting and moving along the molten asthenosphere

What scientific evidence do we have to prove the cracks exist?

Last 30 Days of Earthquakes

Earthquakes occur along the plate boundaries!!

Evidence: 1. volcanoes and earthquakes occur in predictable regions (eg. Ring of Fire)

We know that the Earth has a magnetic field (North on top, South at the bottom)

Any iron found in newly made rock will point North

Once in a while, the Earth’s magnetic field reverses

Suppose North is now down “South” …and the magnetism in the newly formed rocks will reverse

Exploring the Magnetic “stripes” on sea floor

But why are the magnetic stripes symmetrical? There must be a crack in the ocean where the rocks are spreading outward

Evidence: 2. symmetrical magnetic stripes occur on either side of spreading mid-ocean ridges

Hawaiian Islands are not on the plate boundary. How did they form?

Hot Spot The plate must be moving over the hot spot

Each island was formed one after the other

Evidence: 3. formation of the Hawaiian islands as the Pacific Plate moves over a central hot spot