How paleontologists estimate geologic time through radiometric dating Frre srx dating site with no login required

However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.

This is what archaeologists use to determine the age of human-made artifacts. The half-life of carbon-14 is only 5,730 years, so carbon-14 dating is only effective on samples that are less than 50,000 years old.While the oldest known rocks on Earth are about 3.5 billion years old, researchers have found zircon crystals that are 4.3 billion years old [source: USGS].Based on the analysis of these samples, scientists estimate that the Earth itself is about 4.5 billion years old.You can learn more about fossils, dinosaurs, radiometric dating and related topics by reading through the links below.Radiometric dating isn't the only method of determining the age of rocks.

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