A rainbow is not an object hanging in the sky but a direction i which li happens t return. Ea drop se colour ba towards t sun a a fi angle, s the drops that reach your eye are those lying on a cone with your head at its point. The ground cuts the cone off, which is why an arc is all that shows, and why a rainbow seen from an aircraft can be a complete circle instead.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.