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This is an activity about circular motion. Learners will explore the laws of motion and force by observing circular motion.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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In this activity on page 1 of the PDF, learners compare the relative sizes of biological objects (like DNA and bacteria) that can't be seen by the naked eye.

free Ages 8 - 18 10 to 30 minutes
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In this activity, learners use tsunami time travel maps to predict how long it will take a tsunami to reach the shore.

free Ages 14 - adult 1 to 2 hours