[24-Aug-2022] Students learn about ocean currents and the difference between salt and fresh water. Using colored ice cubes, they see how cold and warm water mix and how this mixing causes currents. Students also learn how surface currents occur due to wind streams, how fresh water floats on top of salt water, the difference between water in the ocean and fresh water throughout the planet, and how engineers are involved in the design of ocean water systems for human use. Authors have included extensive sections for educators on grade level, engineering connections, learning objectives, materials list, procedures, introduction to students, assessment, extensions, and alignment to Next Generation Science Standards (NGSS). This curricular lesson (targeting grades 3-5) is part a larger curriculum on Water Cycle.

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