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Comparing the Density of an Object to the Density of Water
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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.

Weighty Questions
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In this activity about humans and space travel (page 1 of PDF), learners compare and contrast the behavior of a water-filled plastic bag, both outside and inside of a container of water.

OBIS Oil Spill
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In this outdoor activity, learners simulate an oil spill using popcorn (both oil and popcorn float on water), and estimate the spill's impact on the environment.

Sink or Float?
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In this water activity, learners test which objects float and which sink. Learners discover that objects behave differently in water.
Float or Sink?
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In this water activity, learners test which objects float and which sink. Learners discover that objects behave differently in water.

Trash Traits
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In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.
Build A Hydrometer
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In this activity, learners will explore how a hydrometer works by building a working model and conducting experiments.

Boats Afloat
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In this water activity, learners build boats that float and sink. First, learners listen to the book, "Who Sank the Boat" and practice making predictions throughout the story.

Sink or Swim?
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In this activity, learners identify different plastics in a mystery bag. Learners discover that plastics are classified #1 through #7.

Prepare for a Dock Shop Field Trip
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In this activity, learners explore what makes a boat float and sink. They examine and test various objects to determine why objects float or sink.

Comparing the Density of Different Liquids
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Learners carefully pour vegetable oil, water, and corn syrup in any order into a cup and discover that regardless of the order they are poured, the liquids arrange themselves in layers the same way.