How is plate tectonics responsible for mountain building volcanoes earthquakes and ocean trenches?

If your question is "How are earthquakes and volcanos triggered by plate tectonics?", then here is my best explanation. Earthquakes are caused by two tectonic plates smashing together and buckling either upward (Forms a volcano/mountain) or downward (forms a trench/faultline) to trigger an earthquake. If one of the plates goes under the other then I believe the magma leaks out and forms a mass of volcanic rock that can either create a land mass, or make an underwater volcano/mountain.