Why are clouds classified on the basis of height?

Correct answer: Because cloud form and effect change at different heights

Correct answer: A. Height is useful because temperature, pressure, moisture, and wind conditions change with altitude. These conditions influence whether a cloud is thin or thick, layered or towering, and made mainly of water droplets or ice crystals. They also affect the cloud’s possible weather influence, such as precipitation, although height alone does not guarantee a particular weather event. B is false because height helps describe and compare cloud forms. C is false because clouds are suspended in the atmosphere; only fog is essentially a cloud at or near the ground. D is false because clouds differ greatly in structure, altitude, thickness, and appearance. Height-based classification is therefore a practical way to organize cloud groups, alongside shape and vertical development. Memory cue: altitude changes the cloud’s environment, and the environment changes its form and effect.