Wood is an example of a solid. Wood is one of the most useful and verstaile materials available. Wood is used in many different ways. Wood may be used to construct a house. For example, wood is used to create a deck. It is also used as plywood on a roof and underneath the shingles of a house. Wood material is formed of fibers, tiny cellulose strands stuck together with a natural adhesive called lignin. It's by seperating and reogranizaing those fibers that paper is made