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The idea of radioactive decay and half lives, a type of absolute dating, is shown through an activity using M&M's candy and graph paper. Sequencing Time, University of California, Berkeley. This 5-12-grade activity lets students place parts of their own life story into a time line so that they can better understand how geologic time is reconstructed by scientists.

Who's on First, University of California, Berkeley. This website is a book chapter about geologic time. This online version of their informative booklet contains short, content explanations about relative time, major geologic time divisions, index fossils for use in age dating, radiometric dating and the age of the earth.

Watch this video to find out how we use index fossils to establish the relative ages of rocks.

In previous lessons, we talked about the Geologic Time Scale and how scientists use it to piece together the history of the earth.

Unlike people, you can’t really guess the age of a rock from looking at it.

Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.

The Earth and Space Science content standards, grades 5-8, of the National Science Education Standards include: Structure of the earth system; Earth's history; and Earth in the solar system; none of which can be mastered without good conceptual understanding of geologic time.

Thus, it is no surprise that geologic time is difficult for students of all ages to conceptualize.

This 9-12-grade activity introduces students to age dating with exercises using relative and absolute dating. Links to various activities and lesson plans concerning relative and absolute dating. Content information about absolute and relative dating methods used by the U. Free 5-day trial You may already know how to date a fossil with a rock.But did you know that we can also date a rock with a fossil?This group is dedicated to providing information about the scientific method as it concerns the idea of evolution in the Creation/Evolution debate. The site provides background information about stratigraphic principles and relative time, biostratigraphy (using fossils for relative dating), and radiometric dating.

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