When creating his silverpoint drawing heads of the virgin and child, raphael employed a process in which the artist uses closely arranged parallel lines to create value?

Hatching is the answer 

It depends on what type of third separates the three notes.for example: if you have two mayor thirds is an "aumented chord"if you have two minor thirds is an "diminued chord"if you have one mayor first and then one minor is a "mayor chord"and inverted is a "minor chord"