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plate boundaries

continental drift it is a theory that the continents drifted apart
sea floor spreading Harry Hess discovered that magma was rising on the sea floor causing it to spread. It also made tectonic plates move from magma coming to the surface.
convection currents transfers energy in the mantle. causes the hotter magma to rise . also causes the cooler magma in the mantle in sink.
divergent boundaries 2 continental crusts diverge and create a rift valley in Africa. New crust is created over millions of years water will eventually fill the valley.
transform boundaries plates that slip sideways past each other creating earthquakes . Mostly found at the sea floor
normal fault caused by tension )divergent)
reverse fault caused by compression (convergent)
strike slip fault caused by shearing (transform)
converging boundaries two oceanic crusts collide and push against each other. the older and denser crust does below the other. This creates volcanic arc islands
ring of fire a long chain of volcanoes that surround the Pacific ocean. One of the most active volcanic eruptions sites.
Created by: chloewalerius



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