Tectonic plates - a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere., Volcanoes - an opening in the earth's crust through which lava, volcanic ash, and gases escape, Epicenter - the earth's surface directly above the place of origin, or focus, of an earthquake, seismologist - Earth scientists, specialized in geophysics, who study the genesis and the propagation of seismic waves in geological materials., mountain ranges - a line of mountains connected by high ground., seismic activities - types, frequency and size of earthquakes that happen over a period of time in a certain area, plate boundaries - the edges where two plates meet, Plate tectonics - theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core.,

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