Why is u 238 used for dating rocks

For example, the remaining radioactive parent material will decrease by 1/2 during the passage of each half-life (1→1/2→1/4→1/8→1/16, etc.).

Half-lives as measured today are very accurate, even the extremely slow half-lives.

During the molten state it is assumed that the intense heat will force any gaseous daughter elements like argon to escape.For example, uranium will radioactively decay through a series of steps until it becomes the stable element lead. The original element is referred to as the parent element (in these cases uranium and potassium), and the end result is called the daughter element (lead and argon).The straightforward reading of Scripture reveals that the days of creation () were literal days and that the earth is just thousands of years old and not billions.If we walk into a room and observe an hourglass with sand at the top and sand at the bottom, we could calculate how long the hourglass has been running.By estimating how fast the sand is falling and measuring the amount of sand at the bottom, we could calculate how much time has elapsed since the hourglass was turned over.

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