Activity
NASA

Water Works on a Blue Planet

For Students 6th - 12th
Keep within a water budget. Learners find out that less than 2.5% of Earth's water is available to drink—and that there is a fixed amount of water. Scholars read an interesting article comparing the available water to a game of Monopoly...
Article
Open Curriculum

Open Curriculum: Recycling Matter in Ecosystems

For Students 9th - 10th
Students learn about biogeochemical cycles that recycle matter on Earth.
Article
University of Illinois

University of Illinois Extension: Energy and Ecosystems Use Some Lose Some

For Students 4th - 5th
Life on Earth is possible because energy flows one way through ecosystems, while matter cycles endlessly. Water and elements, such as carbon, nitrogen, phosphorous, and sulfur are examples of matter that cycles through ecosystems.

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