![The planet Earth is made up of three main layers](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/resources/geo-quiz.jpg)
![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/transp.gif)
![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/arro4.gif) |
Earth Science Quiz poses questions about volcanoes, three kinds of rocks, earth's layers, and more...
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![The city of Craggy Rock needs your help to build four new bridges.](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/resources/challenge.jpg)
![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/transp.gif)
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![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/transp.gif) |
![Our dice game allows you to see how increasing or decreasing the number of dice rolls effects an outcome.](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/resources/explore.jpg)
![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/transp.gif)
![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/arro4.gif) |
Dare to Compare invites you to test your knowledge against students nationally and around the world...
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![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/transp.gif) |
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![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/transp.gif) |
![Image of a carved black horse](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/resources/digging1.jpg)
![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/transp.gif)
![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/arro4.gif) |
Digging for Answers offers interactive quizzes that draw interesting historical facts from the Smithsonian's...
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![](https://webarchive.library.unt.edu/web/20130221170452im_/http://www.free.ed.gov/images/transp.gif) |
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