Liquid layer of iron and nickel
A:crust B:mantle C:outer core. D:inner core

The liquid layer of iron and nickel is C: the outer core.

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.