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Water Body Salinities I
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In this activity, learners investigate the different salinity levels of oceans, rivers and estuaries.
Evolution in Action: Isolation and Speciation in the Lower Congo River
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In this guided discussion activity, learners watch a video about Central Africa's Lower Congo River, one of the most biologically diverse rivers in the world.
Make a Lake
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Where rainwater goes after the rain stops? And why there are rivers and lakes in some parts of the land but not in others?