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plate tectonics:a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the the interaction of rigid lithospheric plates that move slowly over the underlying mantle.
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continental drift: the gradual movement of the continents across the earth's surface through geological time.
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pangea: a hypothetical continent including all land mass of earth, in short all of the present day continents put together in one super continent
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asthenosphere: the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
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lithosphere: the rigid outer part of the earth, consisting of the crust and upper mantle.