Dark rain-giving clouds are generally related to what?

Correct answer: Nimbus clouds

Correct answer: B, Nimbus clouds. Clouds are collections of tiny water droplets or ice crystals suspended in the atmosphere. When a cloud contains enough moisture and its droplets or crystals grow sufficiently large, they may fall as precipitation. Nimbus is the important word associated with rain-bearing clouds; nimbostratus and cumulonimbus are common examples of clouds that can produce precipitation. Cirrus clouds are very high, thin, and feathery, so they are not the usual answer for dark rain clouds. Dust clouds contain suspended dust rather than being a standard rain-cloud category. Fog is a cloud near the ground, not the general name for dark rain-bearing clouds. Memory cue: “Nimbus means rain.”