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The age of a rock can be calculated if its ratio of uranium to lead is known.

Don’t leave your fellow Planet Rock listeners out this summer. If you’re getting bored of the classic dinner date, and have found yourself going to the same restaurants, ordering the same food and having the same conversations, then why not shake things up a little? Admit it - you’ve been living in your hometown for a while now and you still don’t know where the museum is, you still haven’t climbed the church spire and you still haven’t visited that major tourist attraction that you tell all your friends about!

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The intercept of the isochron at the ordinate indicates the isotopic composition of common strontium at the beginning of the process.

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whole-rock dating Igneous and metamorphic rocks that contain no minerals but have particularly high Rb: Sr ratios (see RUBIDIUM-STRONTIUM DATING), or rocks that are too fine-grained for mineral separation, can be analysed as whole-rock samples.

Whole-rock samples from different parts of the same body generally differ in rubidium content and the Sr ratio changes in each part of the rock, the slope of the isochron increases progressively, providing a measure of the age of the crystallization.

any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.

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Different methods of radiometric dating vary in the timescale over which they are accurate and the materials to which they can be applied.

All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in the atomic nucleus.

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