We observe that P-waves are bent as they pass across the boundary between the inner and outer core. We observe an S-wave shadow on the opposite side of the earth from earthquake epicenters. We know the inner core is solid because S-waves can't pass through it. You spend a summer as a laboratory assistant for a scientist whose specialty is radiometric age dating, using the 14C dating technique. You know that the half life for 14C is 5,730 years.
Index fossils indicate the age of rocks containing it.
You are working as a geochronologist in a lab on the UM campus. You are hiking in the bottom of the Grand Canyon and you observe tilted sedimentary layers that were beveled and have flat layers of sedimentary rocks deposited on top of them. You examine a geologic map of the state of West Virginia and see a fold which is cored by old rock and flanked by younger rocks. True or False. Because the outer core is deep within the earth and under a lot of pressure, most earthquakes originate there.