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Learners take on the role of environmental engineers as they design water filters.

In this activity, learners use tinfoil to build and test their own boats - which designs will float, and which will sink?

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

In this hands-on activity, learners use the steps of the design process to create a hook to rescue a "space capsule" from the water.

Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

In this activity, learners visualize the differences in water density and relate this to the potential consequences of increased glacial melting.

In this astrobiology activity (on page 11 of the PDF), learners consider what organisms need in order to live (water, nutrients, and energy).

Electrolysis is the breakdown of water into hydrogen and oxygen. This Exploratorium activity allows learners to visualize the process with an acid-based indicator.

Water, whether fresh or salty, serves as one of the best electrical conductors on the planet. Does salt effect its conductivity?

In this water pollution activity, learners create pond water cultures and investigate the effects of adding chemicals or natural nutrients.

In this activity, learners build water-propelled engines from soft drink cans.

In this activity, learners consider the water features they might enjoy at a community park--a pond, brook, water playground (or "sprayground"), or pool--and what happens to the water over time.

Water treatment on a large scale enables the supply of clean drinking water to communities.

In this activity, learners practice the steps involved in a scientific investigation while learning why ice formations on land (not those on water) will cause a rise in sea level upon melting.