R

radioactive decay atomic time and, 42 convection and, 47 crust age and, 82-83 overview of, 39 radioactivity age dating using,

43-45 atomic time and,

41-42 causes of, 39 discovery of, 36-37 Raff, Arthur, 60 Rainier, Mount, 76 recycling, 83 Red Sea, 84 refraction, 68-69 relative age dates, 38-41 religion, 11-12, 24-25 remnant magnetism, 58 Richter, Charles, 66-67, 68-69

Richter Scale, 68-69 rifts, 54, 84 rift zones, 84 Ring of Fire, 76 Runcorn, Stanley, 58-60 Rutherford, Ernest, 38, 42

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