Question

which step of desalination must be done before water is condensed and collected?
○ water is heated until it evaporates.
○ water is frozen, so it becomes ice.
○ water is transported from one area to another area that has little water.
○ water is collected and salt is allowed to settle at the bottom.

Explanation:

In distillation-based desalination (a common method), saltwater is first heated to evaporate the water (leaving salt behind). This water vapor is then condensed and collected as fresh water. The other options do not align with the pre-condensation step of standard desalination processes. Freezing-based desalination is less common, and the other steps are not part of the core evaporation-condensation desalination workflow.

Answer:

A. Water is heated until it evaporates.