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Plate tectonics

Structure of the earth

Divided into 3 layers

The core
The mantle
The crust

The core

Densest part
Made of rocks rich in iron and nickel
Semi-molten outer core
Solid inner core- temperatures over 6000c

Layers from crust to core

Mohorovicic discontinuity
Gutenburg discontinuity

The mantle


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Plate tectonics theory

Alfred Wenger suggested the continents were once all joined together in an ancient
supercontinent he called Pangea. At some point the land masses had drifted apart until they
occupied their current positions on the globe
Evidence for this...
o Continental fit- some continents (Western Africa and South…


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