Question

what causes a rainbow?

Answer 1

A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

Answer 2

aA rainbow is is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in little drops of water making a spectrum of light turning into a rainbow in the sky. It takes the form of a diff. colored circle caused by sunlight after that the rainbowalways appear in the section of the other side of the sun.
 the sun.