Where does the old crust move when the seafloor spreads?

towards the surface of the ocean

away from the continental shelf

towards other old crust

away from the mid-ocean ridge

This is the substance(s) formed in a chemical reaction.

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

Can you match these to the correct definition