Rainbow's colors arch across the sky.

Meaning: This sentence describes the appearance of a rainbow in the sky, with its colorful arc stretching from one side to the other.

Choice of Words: Rainbow is a colorful arc in the sky caused by the refraction and dispersion of sunlight. Colors are the different shades of light that we see. Arch is a curved shape. Across means from one side to the other. Sky is the blue or gray area above the earth.

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