Absolute age dating

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Geologic Time

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Relative and Absolute Dating | Science Quiz - Quizizz

As we learned in the previous lesson, index fossils and superposition are effective methods of determining the relative age of objects. In other words, you can use superposition to tell you that one rock layer is older than another. To accomplish this, scientists use a variety of evidence, from tree rings to the amounts of radioactive materials in a rock. In regions outside the tropics, trees grow more quickly during the warm summer months than during the cooler winter. Each dark band represents a winter; by counting rings it is possible to find the age of the tree Figure The width of a series of growth rings can give clues to past climates and various disruptions such as forest fires. Droughts and other variations in the climate make the tree grow slower or faster than normal, which shows up in the widths of the tree rings.
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Age Dating

Scientists can use more than one method to determine the age of the Earth. Recall that relative age simply states that an object is older or younger than another object. Absolute-age dating is numerical. It is specific regarding the number of years old an object is before the present.
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Geological time scale — 4. Geological maps. Absolute age dating deals with assigning actual dates in years before the present to geological events. Contrast this with relative age dating, which instead is concerned with determining the orders of events in Earth's past. Scholars and naturalists, understandably, have long been interested in knowing the absolute age of the Earth, as well as other important geological events.
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