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For this particular element,  the half-life is 4.47 billion years and uranium/lead dating is  useful for rocks between 1 million and 4.5 billion years (as luck  would have it! Other elements are also used (potassium/argon for  example).The choice of element depends on how widespread it is -  if it isn't found in many rocks then it's not very useful.

radiometric dating has determined that earth is approximately-65radiometric dating has determined that earth is approximately-14

Without this knowledge, he argued that, "As for the future, we may say, with equal certainty, that inhabitants of the Earth cannot continue to enjoy the light and heat essential to their life, for many million years longer, unless sources now unknown to us are prepared in the great storehouse of creation."The same is true of the basis of Kelvin's estimate of the age of the Earth.Since the 1950s, geologists have used radioactive elements as natural "clocks" for determining numerical ages of certain types of rocks. "Forms" means the moment an igneous rock solidifies from magma, a sedimentary rock layer is deposited, or a rock heated by metamorphism cools off.It's this resetting process that gives us the ability to date rocks that formed at different times in earth history.And how  long the half-life is - if the half life is shorter than the age of  most rocks then its equally unuseful.Radiometric dating can only  be performed on igneous rocks.

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