History of the World (the short version) Chap 7 Intro.

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Presentation transcript:

History of the World (the short version) Chap 7 Intro

Age of Earth 4.54 billion years (+/- 1%)

Continental Drift Proposed by Alfred Wegener 1915 Continents formed one landmass in the past—Pangea Began breaking apart 200 mill years ago Have been moving slowly ever since, now in present position

What evidence did Wegener have? Rock Formations –Similar rock types in areas that had been close together Fossils –Similar animal & plant fossils where plates had been together Climate Evidence –Coal deposits in Antarctica –Glacial deposits in Africa, India, Australia & So. America

Continental Drift

or Pangea Ultimata (250 Ma)

Volcano Animation

When Plates Meet Divergent Boundary: plates move apart; cause sea floor spreading at rift valleys. Mid-Atlantic Ridge Convergent Boundary (Subduction): one plate slides beneath another; forms small mountains, volcanoes. Mt. St. Helens, Andes Collision Boundary: Plates slide together, forced upward. Forms large mountain chains. Alps, Himalayans, Appalachia Transform Boundary: faults slide along side one another. San Andreas Fault

You Try It Plate Tectonics Plate Boundary Animation

The untold tragedies of Continental Drift