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In this activity, learners explore nonrenewable resources and learn why these resources are finite.

In this activity, learners will take a step back and learn the history of the land they live on, and the people who used to live on it.

In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

This activity models some of the ways natural processes, such as erosion and sediment pollution, affect Earth’s landscape.