The tectonic movement is triggered by the convection currents in the mantle. These currents are so powerful that they manage to move the tectonic plates on the surface of the Earth. As they move them, the tectonic plates collide with each other, diverge from one another, or slide past each other. As they do, because of the pressure that they cause to one another, or the gaps they live between them, the tectonic plates contribute to lot geological events and formation of features. The mountain ranges, mid-ocean ridges, valleys, oceans and seas, rifts, are all features that occur because of the tectonic plate movement, while the geological events like the earthquakes and volcanic activity are also trademark things that occur because of them.
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c: in the east might be the correct answer