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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 this activity, learners experience firsthand how marine animals' adaptive coloration camouflages them from prey.

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

Water treatment on a large scale enables the supply of clean drinking water to communities.