Stone

 What are stones?

The Earth's outer solid layer, the litosphere, is made of rock. In general rocks are of three types, namely, i gneous, sedimentary, and metamorphic. The scientific study of rocks is called petrology, and petrology is an essential component of geology.**
 * A stone is a naturally occurring solid aggregate of minerals and/or mineraloids.

Kinds of stones
 * Rocks are classified by mineral and chemical composition, by thetexture of the constituent particles and by the processes that formed them. These indicators separate rocks into igneous, s edimentary and m etamorphic . They are further classified according to particlesize. The transformation of one rock type to another is described by the geological model called the rock cycle.**

Characteristics of Stones · Adaptability to sculpture treatment · They can be used in their natural state · Difficult to transport and cut**
 * · Durability

Why are stones are used in constructions?

Because of the advantages they have in constructions, such as durabilty, adaptability and natural state