Age dating of rocks

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The same is true if you take a block away from one of the pyramid's sides, making the rest unstable.Eventually, some of the blocks can fall away, leaving a smaller, more stable structure.The more parent isotopes there are -- and the fewer daughter isotopes -- the younger the sample.The half-life of the isotope being measured determines how useful it is at dating very old samples.Blackberry is designed basically for corporate people, especially made to make communication easier.

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Only hard parts, like bones and teeth, can become fossils.

But for some people, the discovery raised a different question.

Think of the nucleus as a pyramid of building blocks.

If you try to add extra blocks to the sides pyramid, they may stay put for a while, but they'll eventually fall away.

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