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In this simple demonstration, learners investigate the properties of air pressure. Learners place an index card on top of a glass full of water, then invert the glass.

In this quick activity, learners drink Avogadro's number worth of molecules - 6.02x10^23 molecules!

In this simple activity, learners see the production of a gas, which visibly fills up a balloon placed over the neck of a bottle.

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 experiment, learners examine how pressure affects water flow. In small groups, learners work with water and a soda bottle, and then relate their findings to pressure in the deep ocean.

In this simple activity (on page 7 of the PDF), learners use water and liquid dish detergent to see which one removes lipstick better from an index card.

Learners place cut flowers in colored water and observe how the flowers change. The flowers absorb the water through the stem and leaves.

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

Learners act as engineers and design mini submarines that move in the water like real submarines.

In this activity, learners use sieves with different-sized holes to sort balls by size.

In this activity, learners explore why humans sweat. Learners compare the effects of heat on a balloon filled with air and a balloon filled water.

In this activity, learners observe the effect of transpiration as water is moved from the ground to the atmosphere.

In this activity, learners will explore the density of an object in water. Learners will compare what happens to fruits and vegetables in regular and salt water.

In this activity, learners capture and observe planaria, which are worms that eat tiny pond critters.

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 activity, learners investigate convection by using food coloring and water of different temperatures.

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

If you got a big graduated or clear cylinder, water, a pipe, and a tuning fork, you've got a sound learning opportunity! Learn about resonance with this Exploratorium Science Snack.

Learners place multiple M&M's in a plate of water to watch what happens as the candies dissolve.

This is a quick activity (located on page 2 of the PDF under Nasturtium Leaves Activity) about surface tension.