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This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.

In this simulation activity, learners observe what can happen when ocean waves churn up water and oil from an oil spill.

By building a simple watershed with paper and markers and then using a spray bottle to simulate precipitation, learners will understand how pollution accumulates in our water sources, especially from

In this quick activity about pollutants and groundwater (page 2 of PDF under Water Clean-up Activity), learners build a model well with a toilet paper tube.

In this simulation, learners explore how ocean currents spread all kinds of pollution—including oil spills, sewage, pesticides and factory waste—far beyond where the pollution originates.

This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

In this activity, learners investigate soil erosion. Learners set up a simulation to observe how water can change the land and move nutrients from one place to another.

In this activity, learners will model the mechanical weathering and erosion of rocks in a stream or river.

In this activity, learners perform an experiment that models a chromatography-like process called electrophoresis, a process used to analyze DNA.

Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle.

In this activity, learners model ancient lunar impacts using water balloons.

In this activity (on pages 36-39), learners make a model of a watershed out of paper, then run water down the mountain to simulate how rainfall and pollution affect watersheds.

In this activity (on page 14 of PDF), learners use a pan full of flour and some rocks to create a moonscape.

This online interactive has three activities in the NanoLab (press the upper right button): Build, Zoom, and Transform.

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

In this online interactive simulation, learners will add different salts to water and then watch the salts dissolve and achieve a dynamic equilibrium with solid precipitate.

In this experiment, learners work in pairs to create two gloves -- one that contains a layer of shortening (blubber) inside, and one that doesn't.

This kinesthetic science demonstration introduces learners to four states of matter: solid, liquid, gas, and plasma.