.Insert the right words.
a)develop b) cement c) electricity d) thermoplastics e) are used
f)processes j) various natural substances
1.A variety of materials ... in different products.
2.Extracted materials, such as plastics, alloys and ceramics, are created
through the processing of....
3.Biological materials are substances that... as part of a plant or animal.
4.Extracted materials are created through ... that expend a great deal of energy or alter the microstructure of the substances used to make the ma
terials.