The photograph shows salt. Where does salt come from? O A. The melting of metamorphic rock
B. The weathering of sediment
O C. The crystallization of magma
O D. The precipitation of sedimentary rock

c. The crystallization of magma

Hope that helps! :)

Explanation:

1 a

2 d

3 a

4 c

explanation:

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.