Radiometric dating
{"Image DocumentName": "Types of Radiometric Dating", "Image ImageDescription": "Radiocarbon dating - Measures the decay of carbon-14 in organic material and can be best applied to samples younger than about 60,000 years. Uranium-lead dating - Measures the ratio of two lead isotopes (lead-206 and lead-207) to the amount of uranium in a mineral or rock. This method is one of the two most commonly used (along with argon-argon dating) for geologic dating, applied to samples older than about 1 million years. Uranium-thorium dating - Used to date corals, carbonates, and fossil bones. Its range is from a few years to about 700,000 years. Potassium-argon and argon-argon dating - These techniques date metamorphic, igneous and volcanic rocks, for samples older then a few thousand years.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}