Investigation notes

A crystal is a solid whose tiny particles are arranged in a repeating pattern. In one investigation, an adult stirred salt into warm water until no more would dissolve. This made a concentrated solution. A clean thread was hung in the solution, and the jar was left somewhere safe. As some water slowly evaporated, salt particles joined the thread and formed crystals. After several days, crystals could be seen. The jar was not moved, and nobody tasted the solution.