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What is radioactive dating of rock samples

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A more relevant example: Let us say that a rock is sitting on the surface of the Moon.

A billion years after that rock was formed, the rock is covered and remelted by a lava flow.

There are several common radioactive isotopes that are used for dating rocks, artifacts and fossils. U-235 is found in many igneous rocks, soil and sediment.Two billion years after the lava flow that rock is uncovered by an impact and thrown to the surface.The rock is then picked up by an astronaut, brought back to the Earth, and dated. One thing that should be made clear from the beginning: The age of a rock is really just a measure of how long it has been since the rock cooled to become a rock, not how long the material has been around.You should keep this in mind when we are talking about determining the age of rocks.Many rocks and organisms contain radioactive isotopes, such as U-235 and C-14.