Materials.

Many different types of matter are used to make objects. Each type of matter is called a material.
We have natural  materials  from natural, animal or vegetable  origin and we also have artificial materials that are made in factories from natural materials.
We have worked with different materials ( wood, cork, silk, copper, leather,...) and where do we get these materials from, we have also revised some adjectives and so we have seen some properties of the different materials.