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Radiometric dating is a means of determining the "age" of a mineral specimen by determining the relative amounts present of certain radioactive elements.

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The number of protons in an atom is its atomic number, and the sum of the protons and the neutrons gives its atomic weight.Carbon-14 is a method used for young (less than 50,000 year old) sedimentary rocks.This method relies on the uptake of a naturally occurring radioactive isotope of carbon, carbon-14 by all living things.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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If your best bench is 250 pounds or less, use one pair of 1/2-inch-link chains; these weigh 23 pounds a set, so you are locking out an extra 11.5 pounds.

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