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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.

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These break down over time in a process scientists call radioactive decay.

Radiometric dating, or radioactive dating as it is sometimes called, is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes.

Different methods of radiometric dating can be used to estimate the age of a variety of natural and even man-made materials.

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Carbon dating is used to determine the age of biological artifacts up to 50,000 years old.

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Whereas older singles are more cautious when it comes to dating in the digital era."That said, here are the eight dating habits — new and old — that every single person needs to know about.

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Let’s see if she can continue her trend of outstanding performances tonight. The Voice is actually inviting a former contestant back to perform her new single on Tuesday’s results show. For that matter, it wouldn’t hurt to ditch the group numbers to create three performance spots for past contestants on the Tuesday shows.

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After seeing the pictures online, a couple of netizens left comments teasing Joe, jokingly asking her if she had “offended her stylist that day.” A few also pointed out that her forearms looked chubbier, and asked if she had gained weight over the holidays.

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