What lies at the core difference between a bright white cloud and a menacing dark one?

Answer

The size and concentration of the particles, and consequently, the cloud's depth

The primary factor determining cloud color is depth combined with the physical size and concentration of the water droplets or ice crystals within it. Thin clouds scatter light easily, appearing white, whereas thick clouds block light penetration.

What lies at the core difference between a bright white cloud and a menacing dark one?

#Videos

Why Storm Clouds Are Dark - YouTube

weatherpredictioncloud