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Students study the biogeochemical cycles at work in a miniature aquatic ecosystem. They set up a gallon aquarium, then—each week—measure temperature, water loss, pH, biodiversity, and levels of nitrite/nitrate, phosphate, and hydrogen sulfide. After 2 weeks, students design and perform an experiment to manipulate a parameter of the ecosystem and, in the following weeks, observe the effects on the system. Kit provides materials for 8 groups of students.

• Connected to Unit 1: The Living World: Ecosystems, topics 1.4: The Carbon Cycle, 1.5: The Nitrogen Cycle, 1.6: The Phosphorous Cycle, and 1.7: The Hydrologic Cycle

In this laboratory exercise, students study biogeochemical cycles at work. Students set up a functioning small-scale aquatic ecosystem in a 1-gallon aquarium, and then document its temperature, water loss, pH and biodiversity. They also measure the ecosystem's nitrite/nitrate, phosphate, and hydrogen sulfide levels weekly. They observe and record changes to the biodiversity each week. After 2 weeks, students design and perform an experiment; they manipulate a parameter of the ecosystem and observe the effects of the change on the ecosystem. At least 4 weeks are required to complete this activity. Forty minutes are required during Week 1; afterward, 20 minutes each week for 3 weeks are required to complete the activity.

Note: Order the kit with the perishable material included or with a voucher to request perishables later at your convenience. Contact Carolina or return the voucher to request delivery of perishable material.

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