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

Adialysis unit requires 78.5 l of water.the estimated digit is 5. 

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).