A Rainbow of God

I curve throughout the sky, making myself known, To all the people identifying me down on Earth below. My radiant colors shine brightly in the sun's beautiful glow, I am a sign of peace to all on Earth after a storm, Just as God planned, I appeared to Noah, To fulfill His promise once the flood was formed. I'm known to end with a pot of gold, Or a colorful munchkin land, I often appear in the sky above, Just like God had planned.