Objective 5 October 2012 Describe the theory of continental drift.

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Presentation transcript:

Objective 5 October 2012 Describe the theory of continental drift. Intro Did the Earth always look like this?

Continental Drift

Who? What? Where? When? Alfred Wegener Theory of Continental Drift German scientist who developed the Theory of Continental Drift in 1912 The theory that states that the continents once formed a single landmass, broke up, and drifted to their present locations.

Restless Continents

Restless Continents Evidence of Continental Drift Same fossils found on opposite continents Same rock types found on opposite continents Warm climate plant fossils on cold climate continents

Restless Continents Pangaea All continents were once joined as a single, giant super- continent Greek for “all Earth” Existed 245 MYA

Restless Continents

Restless Continents Sea-Floor spreading The process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies Occurs at mid-ocean ridges (underwater mountain chains) CRT Question

Restless Continents Magnetic Reversals Proof of Sea-floor Spreading Magnetic North and South poles switch positions Recorded when molten rock solidifies

Restless Continents Summary: Alfred Wegener developed continental drift hypothesis explaining that continents once formed Pangaea and then moved to their current positions. This occurs due to sea-floor spreading and that is proved by records of magnetic reversals solidified in new ocean rock.

Objective: 5 October 2012 Describe the theory of continental drift. Outro If Sea-Floor Spreading continues, what will the Earth look like in another 250 MY? Describe it or draw a picture!

Restless Continents When scientists proposed the Theory of Continental Drift, there were many skeptics. Which discovery confirmed that the continents move on plates? Deep-sea currents Earthquake formation Spreading of the sea floor Sedimentary rocks Interim 2