In a way, you are traveling back through time as you descend into the canyon! Geologists work to piece together the story and timeline of these changes using a combination of methods.
The earth is a dynamic system and it is constantly changing, even when we can't see those changes on a daily basis. One method is absolute dating, which uses the half-life of radioactive isotopes to date the age of each rock sample.
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Over the course of hundreds, thousands, and millions of years, the landscape of the earth changes dramatically. A second method is relative dating, which places the order of geologic events by comparing rock layer positions without setting a specific time of formation.