Question

in which environment might you expect a deposit of rock salt or rock gypsum to have formed?
river
shallow sea
beach
deep ocean

Explanation:

Rock salt (halite) and rock gypsum are evaporite minerals. They form when water in a body of water (like a shallow sea) evaporates, leaving behind the dissolved salts. Rivers have flowing water that doesn't allow for significant evaporation - based mineral deposition. Beaches have wave action and sand - related processes rather than the concentrated evaporation needed for these minerals. Deep oceans have high pressure and different chemical conditions that are not conducive to the formation of these evaporite minerals. A shallow sea provides the right environment where water can evaporate, concentrating the salts to form rock salt and rock gypsum.

Answer:

shallow sea