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

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

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

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

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.