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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.Some elements (we’ll call them “A”) in the lava are radioactive, which means that they change into other elements (we’ll call these “B”).However, even if we measured how much of A and B were in a sample of rock, could we figure out how long A has been changing into B, and therefore how old the rock is? We don’t know what the rock was like when it formed, or what has happened to it since. All of these factors will affect how “old” the rock appears—in practice, usually making it appear a lot older than it really is.But even radiometric dating does not actually directly measure the age of something (there is no substance called “age”).It measures the amounts of certain radioactive substances. 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’?
There are a variety of different ways to figure out how old an object is.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).The thing to remember about half-life is that it is a probability.In the example above, 500 atoms are "expected" to decay. It is just what will happen on average over the course of billions and billions of atoms.