Sulfur is a combustible chemical element, nonmetal. People used sulfur still for a long time when such science as chemistry, also was not trace. Alchemists considered that it is gray, as well as mercury, is supernatural substance that it is an obligatory component of any matter, marking elements of fire. Sulfur is generally extracted from natural deposits. But it can also be received also by means of other methods.

By rules of storage of technical documentation it is required that drawings which format is more than A4 were put in a certain way. Now drawings in increasing frequency lead to a due look by means of special cars for an automatic folding (that is to folding under binding). But what to do if the drawing needs to be curtailed independently, manually?

The age of Earth contains about 7 billion years. During this time the planet changed, sometimes practically to unrecognizability. Significant changes in Earth are called the geological periods. With their help it is possible to consider the history of the planet since the birth so far.

Drawings or drawings are printed, as a rule, the small size. Sometimes it is necessary to increase them. It is easy to draw straight lines of the chosen size on a ruler. It is much more difficult to transfer in the increased or reduced look twisting contours precisely. It is possible to change drawings and drawings, using special adaptation which is called the pantograph.