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The most compelling argument for an age of the earth of 4.5 billion years are the large number of independent tests that have been used to confirm this date.

These tests have been performed on what are thought to be the earth's oldest surviving rocks, meteorites, and moon rocks.

Further, he proposed that wherever uncontorted layers were exposed, the bottom layer was deposited first and was, therefore, the oldest layer exposed; each succeeding layer, up to the topmost one, was progressively younger.

The Major Divisions of Geologic Time are shown here, arranged in chronological order with the oldest division at the bottom, the youngest at the top. Specifically, stratigraphy refers to the application of the Law of Superposition to soil and geological strata containing archaeological materials in order to determine the relative ages of layers.

Trees from the same species, growing in the same area or environment will be exposed to the same conditions, and hence their growth rings will match at the point where their lifecycles overlap.

Earth's oldest living inhabitant "Methuselah" at 4,767 years, has lived more than a millennium longer than any other tree.

There are over 130 radiocarbon dating laboratories around the world producing radiocarbon assays for the scientific community. A series of movie clips walks you through the process.These tests have consistently given the same ages for each of these objects.Examples of a number of consistent dates derived from different methods are given.Using these key or index fossils as markers, Smith could identify a particular layer of rock wherever it was exposed.Because fossils actually record the slow but progressive development of life, scientists use them to identify rocks of the same age throughout the world.

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