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  • C2a
    • The earth has an iron core surrounded by a mantle with a thin rocky crust on the outside
    • The crust and the upper mantle are called the lithospheres, this is divided into tectonic plates
    • These rigid plates move on the mantle because of convection currents
    • Continental and oceanic plates
    • Oceanic plates are denser than continental
    • Silica rich magma is viscous and associated with explosive volcanoes.
    • Iron magma is less dangerous
    • Plate tectonics accepted because of evidence from shape; geology and fossils.


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