If grass feels wet rather than dry in the morning, which form may be responsible?

Correct answer: Dew

Direct answer: A, dew. During the night, the grass surface may cool as it loses heat. If its temperature reaches the dew point, nearby water vapour condenses into tiny liquid droplets on the blades. These droplets make the grass feel wet in the morning. A is correct because dew is liquid water deposited on a cool surface. B, frost, is different: it forms as ice when the surface is at or below freezing, so it would normally look or feel icy rather than simply wet. C, lava, is molten rock and has no connection with ordinary wet grass. D, smoke, consists mainly of suspended particles and gases from burning; it does not explain a layer of water on grass. Memory cue: “wet morning grass = dew”; “icy morning grass = frost.”