Distinctions between earth’s crust and mantle are based on: a. rock types b. chemistry c. seismicity d. all of the above

D. All of the above

Explanation:

This is the correct answer because you'd have to experiment to find out more about the Earth's crut and mantle and all these options prove just that :)

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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.