Which of the following cloud types is characterized by vertical development?

Cumulus clouds are characterized by their vertical development, which is a key feature that distinguishes them from other types of clouds. When we think of cumulus clouds, we envision puffy, white formations with a significant vertical extent resembling cotton balls. This upward growth is typically driven by convection processes, where warm, moist air rises and cools, leading to condensation and cloud formation.

In contrast, nimbostratus clouds are generally thick and uniform, often associated with continuous precipitation and having a more horizontal spread. Stratus clouds form in layers and usually cover the sky in a uniform gray, which results in minimal vertical development. Cirrostratus clouds are high-altitude clouds that are thin and wispy, forming a veil-like layer across the sky, also lacking significant vertical development. Thus, the unique vertical structure of cumulus clouds makes them the correct answer for identifying a cloud type that exhibits this characteristic.