In the context of density, which of the following best describes a thermocline?

• A. A boundary between two immiscible liquids with different densities.
• B. A region in a solution where the concentration of solute is highest.
• C. A layer in a body of water where the temperature changes rapidly with depth, resulting in a sharp change in density.
• D. A point in a solid where the density is at its maximum.

Answer: (C)

Verified step by step guidance

1. Understand that density is defined as mass per unit volume, and it can vary with temperature and composition in fluids.
2. Recognize that a thermocline is a concept related to bodies of water, where temperature changes with depth affect density.
3. Recall that temperature affects water density because colder water is generally denser than warmer water, but this relationship can be complex due to water's unique properties.
4. Identify that a thermocline is specifically a layer in a body of water where temperature changes rapidly with depth, causing a sharp gradient in density.
5. Conclude that among the given options, the best description of a thermocline is the layer in water with rapid temperature change and corresponding density change.