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In this seismic simulation, learners play a "who-dunnit" game to explore earthquakes.

free Ages 11 - adult 1 to 2 hours
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In this graphing activity (on pages 33-40), learners investigate how much and what kinds of food sea otter pups eat during their first year of life.

1 cent - $1 per group Ages 8 - 14 1 to 2 hours