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In this activity, learners investigate the different salinity levels of oceans, rivers and estuaries.

When it rains, water can collect on top of and seep into the ground. Water can also run downhill, carrying soil and pollution with it.

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

In this field study, learners discover how to collect data in the field and how their efforts can help certain animals, specifically, amphibians.

In this outdoor, beach activity, learners use tennis balls, water balloons and other simple devices to investigate the movement of waves and currents off a sandy beach.