Stone

 What are stones? Stones are a natural material, which is conform by several mineral. This material is really easy to find in nature.

 How many kinds of stone do you know? Stones are classified in three groups: metamorphic, sedimentary and igneous.

 What characteristics do stones have? They are durable and highly resistant on compression. Also, they come in different colors and textures.

 Why are stones used in construction? As I said before, they are highly resistant on compression and persist over the years. Another reason is that they can be shaped to a variety of forms.



Paragraph One of the most popular materials for construction is stone, because we can find it in nature and it is appropriate for sculptural works, that´s one of the reasons it was so used in ancient times. Stone is a natural material made from an aggregation of minerals. It comes in different colors and shapes. Also, depending on which kind of stone, it could have diverse characteristics like weight, durability, resistance, harness, etc. However, some of the disadvantages of this material are its weakness when it is exposed to tension, its cost and the difficulty to quarry. The material can be worked in two ways, rubble and ashlar-masonry, the first one consists in crushing the stone to get little pieces out of it, and the second consists in cutting big blocks in regular shapes.

Recording: http://vocaroo.com/i/s0kzWobBqfaj