Clouds are divided into four families according to their height range. Which term describes this criterion?

• A. Height range
• B. Temperature
• C. Humidity
• D. Color

Answer: (A)

Height range is the criterion used to divide clouds into four families. Clouds are grouped by the altitude they occupy in the sky—high clouds are well above, middle clouds are at intermediate levels, low clouds form near the surface, and clouds with vertical development extend from the lower levels up to higher altitudes. This altitude-based classification matters because the conditions at different heights affect visibility, lift, and flying safety differently. Temperature, humidity, and color influence cloud formation or appearance, but they aren’t the way clouds are categorized into these four families.