The arcs of color in a rainbow are caused by the refraction, or bending, and internal reflection of light rays that enter the raindrops.
(The arcs of color in a rainbow; are caused; by the refraction) (The arcs of color in a rainbow; bending; ) (light rays; enter; the raindrops)
The arcs of color in a rainbow The arcs of color in a rainbow light rays
are caused bending enter
by the refraction
the raindrops