Continental Drift Theory Template
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Continental Drift Theory Template Presentation Transcript

  • 1. Continental Drift Theory Brittany Gates
  • 2. Alfred Wegener
    • a German scientist, meteorologist, and geologist
    • Came up with the theory of the Continental Drift
    • born on November 1, 1880
    • Died on November 2, 1930 (50 years)
    • He was German
  • 3. Continental Drift Theory
    • Wegner’s hypothesis was that all the continents had once been joined together in a single landmass and have since drifted apart.
  • 4. Continental Drift Theory Evidence
    • Fossils
    • - he found fossils in Africa and South America that were the same animals
    • Climate
    • - Spitsbergen had tropical plant fossils on it.
    • Landmass
    • - lines of a mountain range in South America lines up with the one in Argentina
  • 5. Harry Hess
    • Born on May 24, 1906
    • Died on August 25, 1969
    • Nationality was United states
    • Was a geologist
    • United States officer in World War ׀׀
  • 6. Sea Floor Spreading
    • At the mid-ocean ridge, molten material rises from the mantle and erupts. The molten material then spreads out, pushing older rock to both sides of the ridge.
  • 7. Sea Floor Spreading Evidence
    • Molten Material
    • - found strange rocks shaped like pillows or like toothpaste squeezed from a tube. Only formed when molten material hardens quickly
    • Magnetic Stripes
    • -Magnetic poles reverse themselves.
    • Drilling Samples
    • -They got samples of the ocean floor so they could see if it was molten material
  • 8. Other Definitions
    • Subduction- The process by which oceanic crust sinks beneath a deep-ocean trench and into the mantle.
    • Mid-Ocean Ridge- The undersea mountain chain where new ocean floor is produced.
    • Sonar- a device that determines the distance of an object under water by recording echoes of sound waves.