Plate Tectonics Theory.

Alfred Wegener Theory.

Alfred Wegener In the litosphere are the plate tectonics.  These move forming different types of plates.There is a theroy which was        proposed by Alfred Wegener.




Evidences for continental drift:

  • Geographical:  Fit of the continents
  • Paleonthologycal: Identical fossils were located directly opposite on widely separated continents.
  • Geological: Similar rock types on continents on opposite sides of the Atlantic Ocean.

Plate Tectonics Theory.( )

Concepts of continental drift and seafloor spreading are united into a much more encompassing theory known as plate tectonics.

This is a far-reaching theory that has become the basis for viewing most geologic processes — mountain building, paleontology, volcanism, earthquakes, etc.

The Earth’s surface is composed of rigid plates known as the lithosphere.  These plates overly a weaker region of the mantle known as the aesthenosphere.

There are 7 major plates and over a dozen smaller plates.  Plates move slowly but continously on the order of a few cm/year.


Nerea López Peirona


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