theories

• what are the 4 evidences of continental drift theory?

  1. fossils in africa and south america
  2. positions of mountain ranges
  3. glacial striations
  4. glacial tillites
• glacial striations - scratches in the rock caused by movement of glaciers
• glacial tillites - glacial sediments buried in rock
• plate tectonic theory - what theory explains continental drift
• continental drift theory - theory of the movement of the continents relative to each other
• plate tectonic theory - theory that tectonic plates move
• pangaea - supercontinent that existed during paleozoic and mesozoic eras
• mesozoic era - what era did pangaea break up into 2
• laurasia and gondwanaland - in mesozoic era, pangaea broke up into what 2 places?
• north - is laurasia north or south when pangaea broke into 2
• south - is gondwanaland north or south when pangaea broke into 2
• asia, europe, and north america - in what continents did laurasia break up into?
• cenozoic era - during what era did laurasia break up into continents
• africa, australia, antarctica, and south america - in what continents did gondwanaland break up into?
• centrifugal force - according to alfred wegener, what causes continental drift