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

In this activity, learners build a hot air balloon using just a few sheets of tissue paper and a hair dryer.

In this activity, learners are challenged to design a planktonic organism that will neither float like a cork nor sink like a stone.

In this activity, learners will explore how a hydrometer works by building a working model and conducting experiments.