Final answer:
Dew on a leaf in the morning forms through condensation when the air temperature drops to or below the dew point.
Step-by-step explanation:
When you find dew on a leaf in the morning, it formed via condensation. Condensation is the process in which water vapor changes to liquid water, forming water droplets. In the morning, when the air temperature drops to or below the dew point, the air can no longer hold all of the water vapor it held at higher temperatures, and some of the water condenses to form droplets on the leaf.