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Absolute dating science

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CNN Experts hailed the discovery in as "stunning" -- 47 teeth found in a cave in southern China dated back to 80, to , years ago, challenging widely accepted ideas about human evolution. Fuyan cave in Daoxian County, Hunan province, China, is shown here. Scientists have dated teeth found inside the cave that suggest modern humans arrived in China less than 50, years ago. It suggested that Homo sapiens were in China at least 20, years earlier than early modern humans had been previously believed to have left Africa and spread around the world.
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dating: Absolute Dating

Absolute dating science
Absolute dating science
Absolute dating science
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Regents Earth Science Resources: Geologic History

Relative time allows scientists to tell the story of Earth events, but does not provide specific numeric ages, and thus, the rate at which geologic processes operate. Relative dating principles was how scientists interpreted Earth history until the end of the 19th Century. Because science advances as technology advances, the discovery of radioactivity in the late s provided scientists with a new scientific tool called radioisotopic dating. Using this new technology, they could assign specific time units, in this case years, to mineral grains within a rock. These numerical values are not dependent on comparisons with other rocks such as with relative dating, so this dating method is called absolute dating [ 5 ]. There are several types of absolute dating discussed in this section but radioisotopic dating is the most common and therefore is the focus on this section.
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Dating techniques

Geologists often need to know the age of material that they find. They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years. This is different to relative dating, which only puts geological events in time order.
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A student drew the diagram below to show one kind of radioactive decay. Which of the following statements correctly describes this decay process? She wants to include a timeline on her poster. To determine when a volcano erupted, Michael used a sample of a mineral that formed when the lava cooled and became solid rock. He measured the amount of argon in the sample to find how much potassium had decayed since the rock formed.
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