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Lesson Plan
Curated OER

Footprints: Take a Step into Estimation

For Teachers 3rd - 6th
Compare sizes of student footprints with those of elephants and sauropod dinosaurs! Upper graders make estimations of the areas of irregular shapes; students use grids to make and explain estimates within low and high ranges.
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Worksheet
Curated OER

The Grand Canyon

For Students 7th - 12th
In this geological processes worksheet, students use Google Earth to access pictures of the Grand Canyon. Students look at the layering of rock over time. Students complete 2 short answer questions.
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Lesson Plan
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University of Colorado

Are All Asteroids' Surfaces the Same Age?

For Teachers 6th - 8th Standards
There are more than 600,000 asteroids in our solar system. Pupils analyze images of two asteroids in order to determine if they are the same age. They count craters for each asteroid and compare numbers. 
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Lesson Plan
University of Colorado

Are All Asteroids' Surfaces the Same Age?

For Teachers 9th - 12th Standards
Did you know scientists can tell the age of an asteroid by looking closely at its craters? This final lesson of a six-part series focuses on two asteroids, Gaspra and Ida, in order to demonstrate the concept of dating asteroids. Scholars...