Surface tension of water draws it into a larger drop. It will do that on any nonporous surface- metal, glass, smooth plastic, etc.
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Rain drops are formed in a process called coalescence, where smaller water droplets combine to form larger droplets. Surface tension causes the droplets to minimize their surface area, leading to a nearly spherical shape, which is the most efficient form for minimizing surface area.
Rainbows are formed when sunlight is refracted, or bent, by raindrops in the sky. The sunlight is then reflected inside the raindrop and separated into its different colors due to dispersion, creating the colorful arc we see as a rainbow.
Rainbows are caused by the refraction, dispersion, and reflection of sunlight in raindrops. The sunlight enters the raindrop, gets refracted, reflected off the inner surface of the drop, and then exits the drop. This process separates the different colors of light, creating the visible spectrum of a rainbow.
Rainbows occur when sunlight is refracted, reflected, and dispersed in water droplets in the atmosphere. When sunlight enters a raindrop, it is refracted, reflected off the inside surface, and then refracted again as it exits the drop. This dispersion of light causes the different colors of the spectrum to separate and form a rainbow.
A wall cloud marks an area of low pressure within a mesocyclone. The pressure drop causes a temperature drop, which in turn causes water vapr to condense.