ice core - a sample that contains atmospheric history , fossil - remains of an ancient lifeform , cambrian - trilobites and simple lifeforms appear , uniformitarianism - geologic events repeat over billion of years , superposition - rocks are older at the bottom , relative age - an estimated age , mesozoic - dinos appear and dominate , cenozoic - humans appear and dominate , continental drift - plates move the continents , convection currents - movement here moves the plates , convergent - plates compress together , divergent - plates pull apart by tension ,

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