Age dating of fossils speed dating in nyc over 45

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You've heard about people seeing their lives flash before their eyes.In this interactive, it's an isotope's half-life you watch speed past.It hinges upon the presence of carbon-14, a radioactive isotope of carbon that accumulates in the bodies of animals throughout our lives, and gradually decays after we die.When an American chemist discovered a century ago that radioactive uranium in rock formations decayed into lead, he gave scientists a tool they’ve been using ever since.Examine how this scientific breakthrough led to better calibrating the age of the Earth and its geologic history in the Grand Canyon and throughout the world.This Norwegian spruce's 9,550-year-old root system is credited to the conifer's "ability to clone itself." See how scientists determined its age and why it's expected to keep living for a very long time.

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Strata are differentiated from each other by their different colors or compositions and are exposed in cliffs, quarries, and river banks.Different isotopes have different half-lives and sometimes more than one present isotope can be used to get an even more specific age of a fossil., a new species of ancient human discovered in South Africa’s Rising Star cave.Because rock sequences are not continuous, but may be broken up by faults or periods of erosion, it is difficult to match up rock beds that are not directly adjacent.The layers of sedimentary rock, or strata, can be seen as horizontal bands of differently colored or differently structured materials exposed in this cliff.

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