You might of thought once,
well the answer is water and sun!!
"A rainbow" you say!!!!!!
Rainbows are colours usually in the sky formed by water and sun. It is arced shape, just like a semi circle. Well, actually, the rainbow is a full circle but from most peoples view off the ground they see a semi circle. Most rainbows we see in the sky now will be a "primary rainbow" where the colour red can be seen on the outside (top) through to violet on the inside (bottom). A rainbow is not an object, it can't physically be touched or approached. A double rainbow is where a second, much fainter arc can be seen outside of the primary arc. This is caused by the light reflecting twice inside the water droplets. As a result of this double reflection the colours of the second arc are inverted with violet on the outer edge and red on the inner edge. did you know that no two people see the same rainbow, in fact even our individual eyes see slightly different rainbows. If someone appears to be standing under a rainbow you can see, they will see a different rainbow at the same angle but further away. Isn't that amazing? It has the colours red, orange, yellow, green, blue and purple. To see a rainbow you must have your back to the sun or it won't be visible. Did you know you can never get to the end of a rainbow, when you move the rainbow moves too.
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