Item CL011002: When a container of water is warmed from the bottom, the warmer water at the bottom of the container rises to the top and colder water at the top sinks toward the bottom of the container.

Which of the following statements describes what happens when a container of water is warmed over a flame?

  1. Warmer water at the bottom rises toward the top and the colder water at the top sinks toward the bottom.
  2. Warmer water at the bottom rises toward the top but colder water at the top does not sink toward the bottom.
  3. The warmer water at the bottom does not rise. Heat rises through the water, warming the water as it rises.
  4. The warmer water at the bottom and the heat both rise, but they rise separately.