Grade 6 The River as a Link to the Sea: Basin Management and Estuarine Dynamics Through HANDS-ON activities, Students DISCOVER that: A river’s ESTUARY is an important link to the coastal system. BIOTIC and ABIOTIC factors interact in an estuary. The estuary has a VARIETY of habitats and inhabitants that make it ONE OF THE MOST PRODICTIVE ECOSYSTEMS ON EARTH. Organisms are linked through PREDATOR-PREY interactions in a complex food web. MAN’S ACTIVITES anywhere in the basin, affect the river basin, the estuary, and the coast. On their STUDY-TRIP, students visit an ESTUARY and discover what makes an estuary so productive. <<Back