Stone

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

**Use** The use of rocks has had a huge impact on the cultural and technological development of the human race. Rocks have been used by humans and other hominids for more than 2 million years. Lithic technology marks some of the oldest and continuously used technologies. The mining of rocks for their metal ore content has been one of the most important factors of human advancement, which has progressed at different rates in different places in part because of the kind of metals available from the rocks of a region. The prehistory and history of civilization is classified into the Stone Age, Bronze Age, and Iron Age. Although the stone age has ended virtually everywhere, rocks continue to be used to construct buildings and infrastructure. When so used, rocks are called dimension stone.




 * Paragraph 2**

Stones have many advantages as a construction material, such as: their durability, their adaptability to sculptural treatment and the fact that they can be used naturally. However not all rocks are the same; they have different properties, and because of that they are used for different types of stonework respectively. **// (Name those types of stonework and give their definitions) //** Rocks are very advantageous materials, nevertheless they tend to be expensive; difficult to quarry, transport and cut; and have unfavorable traits like being unstable with load pushing at angles and being weak in tension.

Petra of Jordan, a lost city rediscovered by modern explorers and now considered one of the new Seven Wonders of the World, had become a sign of revelation. **//(What is the connection of this sentence with the previous one????)//** media type="file" key="Stone.mp3" width="240" height="20"