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

Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle.

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 consider how oil spills behave in the ocean and what impact they have on marine wildlife.

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