Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Most water on Earth, like the water in the oceans, contains elements. The elements are mixed evenly through the water. Water plus other substances makes a solution. The particles are so small that they will not come out when you filter the water. But the elements in water can form solid mineral deposits. Answer: solution
Water plus other substances makes what?