A. because they turn opaque(white).
The term that best completes the statement above would be "aria." It is a part of the opera wherein it expresses the music of the ensemble in such a way that it dictates the tone of the opera. It is usually accompanied by an instrument and it is not necessarily song by the opera singer.
Explain the processes used in forming metals. Name one occupation in history that has used forming in metalworking. ... Forming can also include casting, which involving shaping the metal using a hammer or some other form of pressure. Forming has been most commonly used by blacksmiths for centuries.
