During the water cycle, what kind of thermal effect does evaporation produce in water bodies?

Correct answer: Cooling effect

The correct answer is B, the cooling effect. Evaporation occurs when some liquid-water molecules at the surface gain enough energy to escape into the air as vapour. The faster, higher-energy molecules are more likely to leave, so the average kinetic energy of the molecules remaining in the water decreases. A lower average kinetic energy means a lower temperature, producing evaporative cooling. This is why evaporation can cool ponds, wet soil, and skin. A is incorrect because evaporation does not normally heat the remaining water. C is incorrect because energy is being transferred during the phase change. D is incorrect because evaporation can occur below the boiling point and does not mean permanent boiling. The effect is stronger when air is dry, moving, or warm, because these conditions help water vapour leave the surface.