Earth is a closed system. That means the amount of rocks, metals, carbon, nitrogen, oxygen, and water on Earth . So, it is essential that biogeochemical cycles these materials as they move through Earth's subsystems.

The Earth is a "closed system" which means that the amount of rocks,  carbon, metals, nitrogen, water and oxygen on earth remains constant. So it is essential that "biogeochemical cycles renew these materials" as they move through the Earth's subsystems.

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wetland functions are defined as a process or series of processes that take place within a wetland. these include the storage of water, transformation of nutrients, growth of living matter, and diversity of wetland plants, and they have value for the wetland itself, for surrounding ecosystems, and for people.

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disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.