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In this activity, learners investigate the different salinity levels of oceans, rivers and estuaries.

In this activity, learners discuss the different salinities of oceans, rivers and estuaries.

An estuary is a body of water that is created when freshwater from rivers and streams flows into the saltwater of an ocean.

In the wild, small crustaceans known as brine shrimp live in marine habitats such as saltwater lakes.