Friday, March 2, 2012

Wegener- The Continental Drift Man

Alfred Wegener proposed the theory of continental drift, (that all continents at one time were joined together as one) based on several pieces of evidence:
  • the fit of the continents
  • same type of rocks/ mountain chains on different continents
  • fossils of the same organisms have been found on different continents
  • the climates of the continents were different in the past than they are now.
These tectonics plates which consists of the upper mantle and crust move an average of 5 centimeters per year. The movement of these plates has been attributed to the convection currentsin the mantle.

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