15. Describe what makes the crystal grow - be specific, especially using the last \( 2-3 \) paragraphs and the idea of aggregates.

Crystal growth is a complex process that involves the arrangement of atoms or molecules into a structured, repeating pattern, resulting in the formation of a solid crystalline material. Several factors contribute to the growth of crystals, including temperature, concentration of the solute, and the presence of impurities or nucleation sites. One of the key aspects of crystal growth is the concept of supersaturation. When a solution becomes supersaturated, it means that it contains more solute than can be dissolved at a given temperature. This condition is crucial for crystal formation, as it creates an environment where solute particles are more likely to come together and form aggregates. These aggregates serve as the initial building blocks for crystal growth. As the solute molecules or ions collide and adhere to these aggregates, they begin to organize into a structured lattice. The rate of crystal growth can be influenced by factors such as temperature fluctuations, which can either promote or inhibit the movement of particles, and the presence of other substances that may either facilitate or hinder the growth process. In summary, crystal growth is driven by the interplay of supersaturation, the formation of aggregates, and the environmental conditions that affect the mobility and arrangement of solute particles. Understanding these factors is essential for controlling the size, shape, and quality of the resulting crystals.