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convection currents absolute time Earth’s inclination acid rain fossil record atmospheric cycle fracture Big Bang Theory geochemical cycle cleavage hydrologic cycle geologic cycle Mohs scale glaciers oscillating/pulsating theory global warming ozone depletion gravitational effects paleoclimates greenhouse effect radioactive decay paleomagnetism relative time physiographic region topographic map plate tectonics tsunami plate boundaries solar flares (convergent, divergent) superposition tectonic cycle uniformitarianism