A layer-cake profile of different soil types is exposed when we dig into the earth. Geologists reason that these layers were laid down sequentially, and that layers lower down have to be older than the layers above them. This is called the law of:.

the correct answer is blue and green.

a visible spectrum is electromagnetic spectrum color that can be seen by a normal human being by a single wavelength of light. the visible light spectrum is the range of wavelengths that make up visible light. the visible light spectrum passes through a prism enabling the rainbow reveals all the colors in the spectrum. these range from red, orange, yellow, green, blue and violet.