7 Colours of the Rainbow

Have you ever seen a rainbow? Sometimes when the sun is shining and it is rainy somewhere at the same time, you can see a rainbow. It's a huge arch of colours in the sky. It's caused by the light from the sun being broken up by water droplets in the atmosphere. The sun's light is "white", but the water droplets break it up into seven different colours, always in this order:

RED
 
ORANGE
 
YELLOW
 
GREEN
 
BLUE
 
INDIGO
 
VIOLET
 
There is an easy way to remember them (a mnemonic):
- Richard Of York Gave Battle In Vain
 
These colours are the "visible" part of the sun's radiation.

But there are many other parts that are not visible to the
human eye. For example:
- immediately below red is "infraRED"
- immediately beyond violet is "ultraVIOLET" (UV)
 
Word Checker
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arch: a curved symmetrical structure

atmosphere: the air

colour (British English) color (American English)
droplet: a very small drop of liquid
infra: below
mnemonic: a device or trick to aid the memory
ultra: beyond

ROven Varden ANtares