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WHAT HAPPENS TO OCEAN WATER WHEN IT FREEZES?

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Activity time: 20-30 minutes + freezing time
PDF version, with pictures, to download: Sea ice and circulation activity.pdf

BACKGROUND:

The freezing temperature of water depends on the amount of dissolved salts (salinity). Normal ocean water, with a salinity of about 3.4%, begins to freeze when temperatures reach about -1.9

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