Age dating geology

When ‘parent’ uranium-238 decays, for example, it produces subatomic particles, energy and ‘daughter’ lead-206.Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.Over time, carbon-14 decays radioactively and turns into nitrogen.A living organism takes in both carbon-12 and carbon-14 from the environment in the same relative proportion that they existed naturally.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.

These use radioactive minerals in rocks as geological clocks.Once the organism dies, it stops replenishing its carbon supply, and the total carbon-14 content in the organism slowly disappears.Scientists can determine how long ago an organism died by measuring how much carbon-14 is left relative to the carbon-12.Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.The method of reading the order is called stratigraphy (layers of rock are called strata).

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  1. During the Ming dynasty (1368-1644), the familiar underglazed blue-and-white patterns many people associate with fine "china" were developed, while detailed decorative painting over glaze also became a common technique.