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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.

In this outdoor activity, learners visit the intertidal zone of a rocky coastal site well populated with marine organisms.

In this activity, learners create a freshwater ecosystem in a large plastic bottle. Learners cut and prepare bottles, then fill with water, aquatic plants, snails and fish.

In this outdoor activity/field trip, learners investigate organisms that live along the ocean's rocky coast.