Plate Tectonics
- Created by: dairebreen
- Created on: 06-10-17 14:33
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- Plate Tectonics
- Evidence
- Fossil Evidence
- ancient mesosaur reptiles
- gigantic glossopteris ferns
- similar aged rocks
- South America, Africa, India, Antartica
- Separated by salt water
- Parallel Nature of the Continents
- Alfred Wegner
- world had formally been 1 land mass
- Pangaea
- Africa and South America fit together
- Sonar Testing
- oceans were not deep
- huge, linear, underwater mountain ranges
- continents moving apart
- Mid-Atlantic ridge
- Earthquake and Volcano Distribution
- repeated pattern
- exists as a result of plates moving
- Pacific Ring of Fire
- Fossil Evidence
- What is it?
- the plates are floating on top of the mantle
- the theory that the earths crust is divided into large plates
- the plates move
- Crust
- Continental
- thick 10-60km
- less dense 2.7gm/m3
- Granitic SIAL
- from 1000 to 3500 million years old
- Oceanic
- thin 5-7km
- denser 3gm/m3
- Basalt SIMA
- less than 250million years old
- Continental
- Plate Margins
- Away
- constructive plate margin
- Towards
- destructive/ collision plate margin
- Past
- conservative plate margin
- Away
- Evidence
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