One afternoon, Huen and Phong go outside after it stops raining. The Sun comes out, and when they look up, they can see a rainbow. Huyen knows that the different colors of light in the rainbow come from waves that have different wavelengths. If each color has a different wavelength, why are Huyen and Phong able to see all of the different colors at the same time?
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Ответ:
A . People and goods traveled faster resulting in the economy improving
Explanation:
It became a symbol of America's growing industrial power and a source of confidence that led them to take on even more ambitious quests.