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Ancient trash tells archaeologists a lot about the past. In this activity, learners take a close look inside their trash can and think about the clues it offers about their lives.

In this archaeology-related activity, learners build their own time capsule and choose a storage location and a date to reopen it.

This activity helps learners understand how the angle of the Sun affects temperatures around the globe.

Learners observe two model atmospheres -- one with normal atmospheric composition and another with an elevated concentration of carbon dioxide.