Please label the following countries on this map. Germany Belgium Austria Slovenia Romania Hungary France Poland Serbia Greece Croatia Switzerland Czech Republic Bulgaria Slovakia

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.

answer; i believe that the correct answer is (the explosion of a nearby star(supernova);