01/13/2020

Wegener's Evidence on Pangea

• Statigraphy
• Structures (Mountain Belts)

Mapping the Ocean Floors

• before they assumed that the ocean was flat
• they discovered that one of the largest mountain ranges is in the middle of the ocean

Polar Wandering

Polarity Reversals

• sea floor spreading accounts for magnetic anomalies
  1. lava comes up
  2. gets magnetized
  3. spreads out

Plate Tectonics

• Lithosphere (2.7km)
  • Ocean Crust
  • Upper Mantle

Plate Boundaries

• convergent
  • an hitting continent
    • ocean ducks under continent
    • volcanoes form

- Andes mountain range