29 cm.

1.The Biosphere. 2.The energy cycle of the earth. 3. The energy cucle of the biosphere.4.The water cycle. 5.The carbon cycle. 6. The Oxygen cycle. 7. The Nitrogen Cycle. 8.Mineral cycles. 9. Human food production as a process in the biospehere. 10. Human energy production as a process in the Biosphere. 11. Human materials production as a process in the Biosphere.

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