Green
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Green is a colour made by combining yellow and blue. Green is the colour of many plants and living things.
In the poem "Nothing Gold Can Stay", Robert Frost wrote:
Nature's first green is gold, her hardest hue to hold.[1]
Green is also a term used to refer to environmentally friendly products. So green energy could be hydroelectric for instance, instead of fossil fuels.
The colour green corresponds to wavelengths of 520 nanometers to 565 nanometers in the electromagnetic spectrum.[2]