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This medium typically is made of graphite, a crystalline form of carbon:

Which character of art pop art in roy lichtenstein’s artwork choose all that are correct it is inspired by america it depicts by american culture it has delicate lines and detailed shapes it is printed with bold colors and shapes

Riddle me this: i am first in earth, second in heaven, appear two times in aweekyou can only see meonce in a year, althoughi'm in the middle of sea. what am i?