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This activity (located on page 3 of the PDF under GPS: Glaciers Activity) is a full inquiry investigation into the forces of gravity and air pressure.

1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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Learners act as engineers and design mini submarines that move in the water like real submarines.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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This activity about density provides instructions for making a miniature "lava lite" with just salt, oil, water, and food coloring.

1 cent - $1 per student Ages 4 - 8 10 to 30 minutes