Question

Select two parts of the water cycle and explain how they are related to one another.

Answer 1

I'll use evaporation and condensation.

- Evaporation: liquid water (from oceans, lakes, soil, and surfaces) absorbs heat and changes into water vapor, rising into the atmosphere. Sunlight and air temperature drive the rate of evaporation; vegetation also releases water by transpiration (together called evapotranspiration).

- Condensation: water vapor cools or is compressed in the atmosphere until it reaches saturation, changing back into tiny liquid droplets or ice crystals that form clouds or fog. Condensation releases latent heat into the air.

How they are related
- Evaporation supplies the water vapor that makes condensation possible. Without evaporation there is little atmospheric moisture to condense.
- Condensation depends on the amount of vapor produced by evaporation and on cooling (or rising air) that causes saturation. When enough condensation occurs, droplets combine to form precipitation.
- Energy link: evaporation absorbs heat (cooling the surface), while condensation releases that stored latent heat into the atmosphere—this exchange influences weather and vertical air movement.

Example: Sun-warmed ocean water evaporates, moist air rises, cools, and condenses into clouds. Those clouds then may produce rain that returns water to the surface, completing the loop.

Human influence: Warmer temperatures increase evaporation rates, which can increase atmospheric moisture and lead to more intense precipitation events when condensation occurs.