PLATE TECTONICS

3 types of plate tectonics boundaries

3 types of plate tectonics boundaries

There are three types of plate boundary (or margin): constructive, destructive and passive. Constructive margins These arise where two plates move away from each other, and new crust is created at the boundary. They are mainly found between oceanic plates, and are consequently underwater features. Rift valleys may initially develop, but molten rock from the …

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The theory of tectonics

The theory of plate tectonics

The Earth’s lithosphere (crust and upper mantle) is divided into seven large and several smaller plates. These plates are constantly moving, and are driven by convection currents in the mantle. Plate boundaries mark the sites of the world’s major landforms, and they are also areas where mountain-building, volcanoes, and earthquakes can be found.   However, …

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