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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.

Water Body Salinities II
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In this activity, learners discuss the different salinities of oceans, rivers and estuaries.

Trash Traits
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In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.

The Carbon Cycle: How It Works
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In this game, learners walk through an imaginary Carbon Cycle and explore the ways in which carbon is stored in reservoirs and the processes that transport the carbon atom from one location to another