by 
Arnel
ANSWERS: 4
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You could also include tsunamis, Arnel. LOL. The shifting of tectonic plates causes earthquakes, and earthquakes and/or tremors of all magnitudes contribute to volcanic eruptions. To include my addition, these same tectonic shifts/quakes serve as the trigger(epicenter) for tsunamis, even the Sri Lanka one.
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They are related to each other in the gradual cooling and changing of the earth's mantle. If there is a nip in one section, there will be a tuck in another, much as an apple that is placed in an over, as it cooks. There are some excellent, illustrated articles on the internet, if you look.
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Plate-tectonics cause Earthquakes on subduction zones. Those are on convergent bounderies, as one plate goes under another one. The earth buckles up, and like a rubber band storing energy, stretches and twists until it SNAPS back together in an Earthquake. Volcanoes are tricky, we arent sure if eruptions cause earthquakes or earthquakes trigger eruptions, but oen thing is for sure, there there are more and more earthquakes getting bigger and bigger its about to explode.
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Also the tectonic plates move because underneath the earth's crust the earth's mantle has currents in it which move the plates that float on the mandtle. The mantle can have different areas of pressure in it and when the mantle builds up enough pressure it may rupture through the crust where 2 plates meet or where there is a crack in the crust
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