text: A region called Alexanderʹs dark band may separate two of these things.
full_question: A region called Alexanderʹs dark band may separate two of these things. They are centered directly opposite the Sun when they result from reflection and refraction of (*) sunlight. The mnemonic [neh-MAH-nik] Roy G. Biv is used for the colors of—for 10 points—what things that are also created by a prism?
first_sentence: A region called Alexanderʹs dark band may separate two of these things.