Plate Tectonics is theory of global tectonics that has served as the master key in modern geology for understanding the structure, history, and dynamics of the earth's crust. The theory is based on the observation that the earth's solid crust is broken up into a dozen semirigid plates. The boundaries of these plates are zones of tectonic activity, where earthquakes and volcanic eruptions tend to occur. Plate Tectonics also are the cause of major features that exist in the World's oceans today. The Pacific is the oldest of the existing ocean basins. The oldest rocks have been dated to about 200 million years old . The major features of the basin and rim have been shaped by the help from plate tectonics.
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