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How is relative dating used to evaluate geologic time

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Geologic Time. From the beginning of this course, we have stated that the Earth is about 4. How do we know this and how do we know the ages of other events in Earth history? Prior to the late 17th century, geologic time was thought to be the same as historical time. The goal of this lecture is come to come to a scientific understanding of geologic time and the age of the Earth.
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Choose one of the following methods of evaluating geologic time?

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Relative Dating of Geologic Materials

Use relative dating techniques to explain how the structures of the Earth and life on Earth have changed over short and long periods of time. Cite evidence from the rock record for changes in the composition of the global atmosphere as life evolved on Earth. The geologic history of the earth can be interpreted through the study of rock sequences, structure, and the fossils contained in them. Chemical changes in rock composition can trace the evolution of life on earth. The Geologic Time Spiral. National Science Education Standards Geologic time can be estimated by observing rock sequences and using fossils to correlate the sequences at various locations.
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Relative Dating

Geologists count back more than 4 billion years to the oldest Earth materials. Have you ever tried to count to a million? Counting once per second easy at the start, but tough when you reach the hundred-thousand mark , 24 hours per day, seven days per week no weekends off , it would take you 11 days, 14 hours to count to one million!
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Perhaps the most widely used evidence for the theory of evolution through natural selection is the fossil record. The fossil record may be incomplete and may never fully completed, but there are still many clues to evolution and how it happens within the fossil record. One way that helps scientists place fossils into the correct era on the geologic time scale is by using radiometric dating. Also called absolute dating, scientists use the decay of radioactive elements within the fossils or the rocks around the fossils to determine the age of the organism that was preserved. This technique relies on the property of half-life.
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