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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 water loss, temperature, and levels of pH, nitrite/nitrate, phosphate, and hydrogen sulfide. They also observe and record changes in biodiversity each week. After 2 weeks, students design and implement an experiment to manipulate a parameter of the ecosystem and, in the following weeks, observe the effects on the system.

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

The 8-Station Kit is designed for a class of 32 students working in 8 groups of 4. The 1-Station Kit is designed for a group of 4 students. The refill replenishes consumed materials in the 8-Station Kit. Digital teacher's manual, included FREE with kit or refill purchase, is a 12-month eBook license to the Biogeochemical Cycles Teacher's Manual and Student Guide.

Note: Order the kit or refill with the perishable material included (item #181061P, #181063P, or #181062P) or with a voucher to request perishable material later at your convenience (item #181061, #181063, or #181062). Contact Carolina or return the voucher to request delivery of perishable material. Elodea and mixed crustaceans are restricted from shipping into certain states. Restricted states will be shipped compatible organisms and/or plants (Elodea canadensis, Elodea najas, or Chara, depending on availability). Canadian customers must apply for a Canadian Department of Agriculture permit. Residents of AK must apply for a permit from your state game and fish department to receive pond snails. Sold only to schools and businesses.

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