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Freshwater  
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Derived from the Science on a Sphere film entitled "Water Falls," this short (2:50) video presents basic information on the percentage, allocation, and distribution of Earth's usable water.

In this problem-based data analysis activity, students identify trends and make predictions about the possible influence of climatic factors and vegetative growth on macro invertebrates. Step-by-step instructions for use of the MY NASA DATA Live... (View More)

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