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Second, we supply teachers with hands-on/minds-on lessons to develop student understanding, and third, we provide career-oriented resources to expose students to scientists whose work involves concepts in geologic time.

Understanding geologic time is a sub-concept of earth science.

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Geologic Time is captured in at least two different areas. The other is under the Physical Setting--Changes in the Earth's Surface which includes rates of change.

An image of the middle grades (6-8) only part of the Changes in the Earth's Surface map appears below.

Fossils, Rocks, and Time This online book, published by the U. Geological Survey, discusses the use of fossils in determining the age of rocks.

The book covers how to place events in correct temporal order, a description of the geologic time scale, the use of fossils to indicate rock ages, the law of fossil succession, index fossils, and radioactive dating.

Clicking on a concept within the maps will show NSDL resources relevant to the concept, as well as information about related AAAS Project 2061 Benchmarks and National Science Education Standards.

Move the pink box in the lower right hand corner of the page to see the grades 6-8 learning goals.

Through this approach, students are challenged to conceptualize the geologic time scale by comparing it to a student-produced time scale for an older adult’s life.

This formative assessment allows the teacher to alter instruction based on students’ feedback.

The guide is designed to help science educators determine how well an instructional material supports students in learning important science ideas such as those described in national benchmarks and standards.

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