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In this activity, learners create a map of a hidden surface using a "sounding stick" -- a technique similar to how underwater maps were once made.

Over $20 per group Ages 4 - adult 10 to 30 minutes
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Historically, sea floor mapping (bathymetry) was done by soundings.

$1 - $5 per group Ages 11 - 14 2 to 4 hours