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The basic theory of plate tectonic is that along seafloor spreading zones, the continents are separating from one another. As they spread apart, magma comes to the surface and becomes new continental crust. As the tectonic plates move away from spreading zones, they collide with one another.

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If the two plates that meet at a convergent plate boundary both consist of continental crust, they will smash together and push upwards to create mountains. Large slabs of lithosphere smashing together create large earthquakes.

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If the two plates that meet at a convergent plate boundary both are of oceanic crust, the older, denser plate will subduct beneath the less dense plate. ... The older plate subducts into a trench, resulting in earthquakes. Melting of mantle material creates volcanoes at the subduction zone.

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The oceanic plate slides below the continental plate, this happens because oceanic rock is denser than continental

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Video, location and examples of 3 types of plate boundaries.

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Video, location and examples of 3 types of plate boundaries.

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The earth has many tectonic plates which constantly move.

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Alfred Wegener brought together several lines of evidence to support his theory of continental drift. One is quite simple, that the continents look like they could "fit" together, much like puzzle pieces that have drifted apart.