Fill each os the numbered blanks with ONE suitable word.
It is quite a (1).......... to many people to learn that there is no lead in the common lead pencil. The black substance is graphite, (2).......... is often called "black lead". The(3).......... is not a suitable one, however, bacause graphite is nearly pure carbon and contains(4).......... lead.
Graphite is(5).......... os the softest of all minerals. It is dark gray to black in(6).........., and can be recognized by its greasy feel, its soft-ness, and the black streaks that it(7).......... It is very widely dis-tributed over the(8).......... but it is not often found in large deposits. Graphite is used to(9).......... friction. It is also used in making lead pencils, stove black-ing, paints, and many (10).......... things.
