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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