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Learners explore how the attractive forces between water molecules create surface tension and allow certain objects to float on the surface of water.

Learners compare the weight of equal volumes of wax, water, and clay. Learners discover that since the wax weighs less than an equal volume of water, it is less dense than water and will float.

In this activity and/or field trip, learners investigate the water currents that aquatic animals create when they breathe, feed, and propel themselves through water.

Learners explore water adhesion and learn about why water molecules are more strongly attracted to some substances than others.

In this activity, learners act as water molecules and travel through parts of the water cycle to discover that it is more complex than just water moving from the ground to the atmosphere.

Water sticks to all kinds of things in nature — flowers, leaves, spider webs - and doesn't stick to others, such as a duck's back.

Learners create hard water by mixing Epsom salt and water. Then they compare what happens when soap solution is mixed with hard water and regular water.

Water on Earth is in lakes, the ocean, rivers, underground, and frozen glaciers.

In this physics activity (page 10 of the PDF), learners will explore how energy from moving water can be used.

In an investigation called "Shape It!" learners craft tiny boats out of clay, set them afloat on water and then add weight loads to them, in order to explore: how objects stay afloat in water; what th

Learners add different liquids (water, salt water, alcohol, and detergent solution) to water and observe the different ways the different liquids combine with water.

In this activity (page 1 of the PDF under SciGirls Activity: Water Slides), learners will whip up some suds with a cup of water and a tablespoon of dish soap until the bubbles are stiff enough to star

In this activity, learners use the design thinking process to design and build their own aqueduct, or water bridge.

Some aquatic organisms live in open water, while some live in soil at the bottom of a body of water.

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

In this design challenge activity, learners build a boat that can hold 25 pennies (or 15 one inch metal washers) for at least ten seconds before sinking.

In this introductory demonstration and activity, learners are introduced to the concept of density as they explore a rock and a wooden block in water.

This three-part activity consists of an activity that groups of learners develop themselves, a given procedure, and an optional demonstration.

Design a vessel that tests the limits of wind power given a set of off the shelf and recycled materials.

In this investigation, learners explore the force known as buoyancy by placing various objects into water and observing how they behave (for example, which sink more quickly, which float, how much wat