Please help is a model for the measurement of the time available for finding solutions to the depletion of nonrenewable resources, the known reserves, and the human rate of consumption.
A)
Resource Conservation and Recovery Act (RCRA)
B)
R to C ratio
C)
Sustainable development
D)
Materials management
E)
Comprehensive Environmental Response, Compensations, and Liability Act (CERCLA)

B.) R to C ratio

Explanation:

Because the reserves-to-production ratio (RPR or R/P) is the remaining amount of a non-renewable resource, expressed in time. While applicable to all natural resources, the RPR is most commonly applied to fossil fuels, particularly petroleum and natural gas.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.