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Utah Geological Survey: How Do Geologists Know How Old a Rock Is?
Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in. The age of formations is marked on a geologic calendar known as the geologic time scale. Development of the...
Washington State University
Washington State University: Ask Dr. Universe: Is Pluto a Planet Again or Not?
Dr. Universe answers this question after talking with WSU's Katie Cooper. Katie is an expert in the geology of Earth and objects in outer space.