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Learners see that a carrot slice sinks in fresh water and floats in saltwater.

1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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In this astronomy activity (page 3 of the PDF), learners will examine the effects of gravity on a person’s pulse and explore how gravity can differ from planet to planet.

free Ages 11 - 18 10 to 30 minutes
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In this colorful activity (page 6 of the PDF), learners will make a multicolor density column by using different concentrations of sugar solutions.

$5 - $10 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners use cheap, thin plastic garbage bags to quickly build a solar hot air balloon. In doing so, learners will explore why hot air rises.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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Learners apply their knowledge from a previous study to identify different liquids--water, corn syrup, and vegetable oil.

$1 - $5 per group Ages 4 - 8 10 to 30 minutes
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Learners are challenged to discover the relative densities of colored liquids to create a rainbow pattern in a test tube.

$5 - $10 per group Ages 4 - 14 10 to 30 minutes
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Young learners investigate and observe the properties of three liquids -- water, vegetable oil, and corn syrup. They use their senses to collect data and ask and answer questions.

$1 - $5 per group Ages 4 - 8 10 to 30 minutes
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Learners observe working lava lamps to understand how they work (included in PDF link).

$10 - $20 per group Ages 8 - adult 10 to 30 minutes
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In this activity (on page 2), learners create a submarine using a plastic cup. This is a fun way to learn about buoyancy and density.

$1 - $5 per student Ages 8 - 14 10 to 30 minutes
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In this activity, learners will create a drawing with dry erase markers and watch it come to life. Learners will explore chemistry, art and storytelling through this activity.

$1 - $5 per student Ages 4 - 14 10 to 30 minutes
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In this activity, learners experiment with the density of ice, water, and oil. Learners will discover that the density of a liquid determines whether it will float above or sink below another liquid.

$1 - $5 per student Ages 6 - 11 10 to 30 minutes
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In this activity, learners compare water pressure at different depths. Learners discover that water pressure increases with depth.

$1 - $5 per group Ages 8 - 11 10 to 30 minutes
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In this activity, learners investigate the Moon's infancy and model how an ocean of molten rock (magma) helped shape the Moon that we see today.

Over $20 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners make their own heat waves in an aquarium.

$5 - $10 per group Ages 8 - 18 10 to 30 minutes
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In this activity, learners discover the difficulty of ocean exploration by human beings as they investigate water pressure.

$5 - $10 per group Ages 8 - 11 10 to 30 minutes
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It's difficult to see convection currents in any liquid that's undergoing a temperature change, but in this Exploratorium Science Snack, you can see the currents with the help of food coloring.

1 cent - $1 per student Ages 8 - 18 10 to 30 minutes
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In this kinesthetic activity that demonstrates pressure, learners act as air molecules in a "container" as defined by a rope.

free Ages 8 - 14 10 to 30 minutes
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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.

$1 - $5 per group Ages 8 - 18 10 to 30 minutes
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In this activity, learners use oil, water, food coloring and antacid tablets to create a bubbling lava lamp. Use this activity to introduce concepts related to density, hydrophobicity vs.

$5 - $10 per student Ages 6 - 11 10 to 30 minutes
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In this activity, learners separate materials based on their special properties to mimic the way recyclables are sorted at recycling centers.

$1 - $5 per student Ages 6 - 11 10 to 30 minutes