Solution process is most visible in which materials?

Correct answer: Soluble minerals like rock salt and gypsum

The direct answer is B: solution is most visible in soluble minerals such as rock salt and gypsum. Solution is a chemical weathering process in which water dissolves a mineral and carries it in dissolved form. The reasoning is simple: water contacts a soluble substance; the substance enters the water; the dissolved material may later be transported or deposited elsewhere. Rock salt is especially soluble, and gypsum is also more soluble than many common silicate rocks. Option A is wrong because quartz and hard basalt are not the best examples of direct solution; quartz is relatively resistant. Option B is correct because it gives standard soluble minerals. Option C is wrong because dry ash is not a general example of mineral solution. Option D is wrong because fresh lava is a rock material, not the defining answer for solution. Exam cue: salt plus water means solution.