The dells granite which contains up to 40 ppm uranium is exposed over an area ofapproximately 5 square miles. However some large bodies of igneous rock contain higher than average amounts of uranium and thorium. Typically found in very low concentrations ranging from less than 1 part per million ppm to about 8 ppm uranium in the earth s crust averages about 2 5 ppm while the concentration in seawater is about 0 003 ppm.
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