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Plate Tectonics

QuestionAnswer
what is the core made of? nickel and iron
The mantle has 3 layers, what are they? lower mantle, asthenosphere and litosphere
Where is the litosphere? the upper mantle and crust combined
What is the boundary where the upper mantle meets the crust moho discontinuity line
what is sial found in the continental crust in rocks like granite which is rich in the minerals silica and aluminium
what is sima in the oceanic crust eg basalt is rich in silica and magnesium
who made up the theory of continental drift? Alfred Wegner
Who made up the theory of convection currents? Arthur Holmes
who made the theory of seafloor spreading? Harry hess
Proof of continental drift Coastlines fit together like a jigsaw Matching plant fossils were found in South america and Antarctica
Whats subduction? The sideways or downwards movement of the edge of a plate into the mantle underneath another lighter plate
How many plates are there? 7
Name 3 plates The north american plate, nazca plate and eurasian plate
Created by: Megan k
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