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In this activity, learners explore the different salinities of various sources of water by taste-testing.

In this quick activity, learners observe how the added sugar in a can of soda affects its density and thus, its ability to float in water.

In this activity, learners conduct an experiment to explore how water flows up from a tree's roots to its leafy crown.

In this activity, learners separate materials based on their special properties to mimic the way recyclables are sorted at recycling centers.

In this activity, learners conduct three experiments to examine temperature, the different stages of the water cycle, and how convection creates wind.

In this activity, learners will explore the water cycle by creating a small atmosphere.

In this activity on page 11 of the PDF, learners follow simple steps to recycle old newspaper into new paper.

Learners investigate the properties of the liquids in two bottles. One contains layers of oil and water, and one contains oil, water, and soap.

In this activity, learners will explore saturated solutions and discover how crystals form.

In this experiment, learners examine the way oil affects bird feathers and test different cleanup methods to find out which works best.

In this activity, learners participate in several full-body interactive games to model the process of self-assembly in nature and nanotechnology.

In this meteorology activity, learners build weather vanes using straws, paperclips, and cardstock.

This is an activity about turbidity, or the amount of sediment suspended in water.

In this activity, learners create a biosphere in a baggie.