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Historically, sea floor mapping (bathymetry) was done by soundings.

$1 - $5 per group Ages 11 - 14 2 to 4 hours
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In this activity on page 27, learners perform an experiment to learn about how different types of marine debris degrade and how weather and sunlight affect the rate of degradation.

$1 - $5 per group Ages 8 - 14 1 to 12 months