The diagram shows molecules in a fluid. Explain the sequence of events that happens when this fluid cools down. Be sure to focus on what happens to the molecules and to the fluid in general. Five events should be included in your answer.

Answer:

1. The fluid loses heat. 2. Its molecules lose kinetic energy and move more slowly. 3. The molecules move closer together, causing the fluid to contract and become denser. 4. The cooler, denser fluid sinks. 5. Warmer, less-dense fluid rises to replace it, creating a convection current that moves heat through the fluid.