Radiometric dating, or numeric dating, determines an actual or approximate age of an object by studying the rate of decay of radioactive isotopes, such as uranium, potassium, rubidium and carbon-14 within that object. This rate provides scientists with an accurate measurement system to determine age.For example, carbon dating is used to determine the age of organic materials.They then apply their new understanding to make predictions regarding complications involved in the decay process and its use in dating (such as daughter loss).

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Basically, fossils and rock found in lower strata are older than those found in higher strata because lower objects must have been deposited first, while higher objects were deposited last.

Relative dating helps determine what came first and what followed, but doesn't help determine actual age.

This page is a regularly updated plan for 8th-grade science classes.

Keyword(s) and Warm-up are usually completed during the first five to ten minutes of class.

The age of the fossil will be an age range between the ages of the two volcanic layers. The diagram below shows a portion of the Geologic Time Scale.

Relative dating and radiometric dating are used to determine age of fossils and geologic features, but with different methods.

This paper describes in relatively simple terms how a number of the dating techniques work, how accurately the half-lives of the radioactive elements and the rock dates themselves are known, and how dates are checked with one another.

In the process the paper refutes a number of misconceptions prevalent among Christians today.

This paper is available on the web via the American Scientific Affiliation and related sites to promote greater understanding and wisdom on this issue, particularly within the Christian community.