An image of Earth's layers is below What is layer C?
Crust
Mantle
Inner core
Outer core

the mantle is layer C.

Explanation:

the crust would be layer A. inner core would be layer D. outer core would be layer B.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

answer; talc and gypsum;