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Uranium-Lead dating is a radiometric dating method that uses the decay chain of uranium and lead to find the age of a rock.As uranium decays radioactively, it becomes different chemical elements until it stops at lead.For example, as shown at left below, uranium-235 has a half-life of 704 million years.That means that in 704 million years, one gram of uranium will be reduced to ½ gram of uranium.Most scientists today believe that life has existed on the earth for billions of years.

Uranium-lead dating uses four different isotopes to find the age of the rock.

The reason for stopping at lead is because lead is not radioactive and will not change into a different element.

It may sound straight-forward, but there are many variables that have to be considered.

This week, Cherry Lewis of the University of Bristol presented a talk about the history of dating the Earth as part of the BA Festival of Science in York, England.

Before so-called radiometric dating, Earth's age was anybody's guess.

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In the 21st century, the rivalry added a new chapter with the nickname Dos a Cero (2–0) to U. The first meeting between Mexico and the United States ended in a 2–0 win for the U. Two days later, on February 12, 2004, Mexico defeated the U. 4–0, and the crowd was heard chanting "Osama, Osama, Osama", in reference to Osama bin Laden and the September 11, 2001 terrorist attacks. After the goal, Mexico goalkeeper Oswaldo Sánchez tried to trip U. player Eddie Johnson as Johnson was running to celebrate the goal. On February 11, 2009, the first qualifier for the 2010 World Cup was held in Columbus Crew Stadium, and resulted in a 2–0 victory for the U. Hejduk did not retaliate, and Ramirez was not reprimanded. Another was played during the 2008 CONCACAF Women's U-20 Championship at Puebla, Mexico, where the U.

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