What forces do scientists think cause tectonic plates to move?
Its just when two plates slide past each other, that creates tension which usually creates an earthquake or a volcanic eruption, or even a tsunami. When Tectonic plates move and cause earthquakes, that's most commonly a strike slip fault. that's what the San Andreas fault is, a strike slip.
Movement of tectonic plates is driven by the Earths internal, heat which causes convection in the mantle. Rocks in the mantle behave the same way, but because they are solid, the movement is millions times slower. the rocks in the mantle have a small amount of melt.
According to the theory of plate tectonics, what changes will occur to the oceans and the continents over the next millions of years?
The oceans and the continents will move over time and the continents will possibly puzzle back up with each other. Also the oceans will become bigger and new oceans will form. Our earth orbits and our plate tectonics move so therefore our continents and oceans will move and change very slowly.
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