Which two phenomena are observed when dew forms on grass in the morning and disappears after the sun comes out?

Which two phenomena are observed when dew forms on grass in the morning and disappears after the sun comes out?

• A. Condensation and precipitation.
• B. Evaporation and freezing.
• C. Sublimation and deposition.
• D. Condensation and evaporation.

Answer: (D)

Moisture changes state as temperatures shift. Overnight, the air near the cool grass reaches a point where water vapor condenses into liquid on the blades—that’s condensation. When the sun rises and warms the grass, energy lets that liquid water turn into vapor and escape into the air, which is evaporation. Dew isn’t precipitation, and it isn’t a solid–gas change like sublimation or deposition. This combination—condensation forming the dew and evaporation making it vanish as it’s heated—explains what you observe.

Moisture changes state as temperatures shift. Overnight, the air near the cool grass reaches a point where water vapor condenses into liquid on the blades—that’s condensation. When the sun rises and warms the grass, energy lets that liquid water turn into vapor and escape into the air, which is evaporation. Dew isn’t precipitation, and it isn’t a solid–gas change like sublimation or deposition. This combination—condensation forming the dew and evaporation making it vanish as it’s heated—explains what you observe.