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Purchasing - To obtain a product in exchange for money or its equivalent. If scientists find a layer of volcanic ash with a known date on one side of a valley and also find a layer of ash with the same chemical fingerprint somewhere else in the valley, they can assume these layers were laid down at the same time. Creature Cast. Keywords Keywords for this Article. Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free. Absolute dating methods measure the physical properties of an object itself and use these measurements to calculate its age. They can also include events like metamorphism.

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