Geology relative dating techniques

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The meteorites that fall to Earth today have orbited the Sun since that time, unchanged and undisturbed by the processes that have destroyed Earth's first rocks.

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They also believed that all the physical features of Earth—mountains, valleys, oceans, rivers, continents—were the same as they had always been.Stratigraphy: The branch of geology that catalogues Earth's successions of rock layers.Half-life is a measurement of the time it takes for one-half of a radioactive element to decay.Geologists easily identify rocks containing fossils of primitive life-forms as being older than rocks containing fossils that are more evolved or advanced.However, the method of relative dating is exactly that, relative. In addition, complex lifeforms have existed on Earth for only the last 600 million years.

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