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In a way this field, called geochronology, is some of the purest detective work earth scientists do.
So something that lived (and died) when the proportion of C was less than normal would appear to have died more years ago than it actually did (for example, it might give an age of 3,000 years before the present, rather than its true age of 2,000 years).
When they find one, they gather a sample of the hardened lava and send it off to a laboratory to test it for radioactive elements.
When a volcano erupts, hot, molten rock (called “lava”) from deep inside the Earth is released. Elements are the “building-blocks” of the universe (for example, water is made from the elements hydrogen and oxygen).
Most people think that scientists can actually measure the ages of rocks, using a method called “radiometric” or “radioisotope” dating.
More often, rocks are “dated” by the fossils they contain, based on a pre-existing belief in evolution.
Of course, the best method is to check the account of a reliable eyewitness, if one is available. Since it is the written Word of God, we can trust it to tell us the truth about the past.
Carefully studying the Biblical record, we find that the universe has an age of around 6,000 years, and that a world-changing, global Flood occurred about 4,300 years ago. It’s important that we allow God’s written record of history, the Bible, to guide our thinking about the past—this includes our understanding of the age of the Earth/universe How many times have you heard something like, “This animal lived 50,000 years ago”, or “This person died 20,000 years ago’?Have you ever wondered how the scientists knew the age of the bone?The test results ranged from between 340,000 to 2.8 million years old!Other scientists collected samples from cooled lava flows from Mt Ngauruhoe, in New Zealand.Relative age dating also means paying attention to crosscutting relationships.