The figure below illustrates how nutrients cycle between organic and inorganic reservoirs. Within each reservoir the nutrient may be available or unavailable for use. 
According to the figure above, what is the inorganic reservoir where phosphorus is unavailable?
Definitions:
Court
A governmental institution authorized to resolve legal disputes, interpret laws, and administer justice.
Appeal
A formal process whereby a higher court will re-examine a decision made by a lower court.
Civil Court
A type of court where non-criminal matters are adjudicated, including disputes between individuals and organizations regarding rights, contracts, and property.
Right
An entitlement or justified claim to certain freedoms or entitlements according to legal, social, or moral principles.
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