Age is Relative
The question of age can be applied to humans, clothing, food, furniture, and fossils. Doctors study how humans age and can observe how hair turns grey and skin becomes wrinkled. Rocks and other organic materials do not always provide observers the same outward changes. In order to determine the age of a material; including human bones, radiometric dating can be applied. Determining the amount of radioactive isotopes in a geological or archeological specimen can help decipher its relative age. Since all rocks and minerals contain radioactive elements, the decay process is like a clock that a geologist can read since different radioactive elements have independent “clocks” or half-lives. Read more about radiometric dating in your textbook.
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Use this reference when referring to your text:
Trefil, J., & Hazen, R.M. (2016). The sciences: An integrated approach. Hoboken, NJ: John Wiley & Sons, Inc.