Hi i'am Sean , i study in OUR OWN ENGLISH HIGH SCHOOL .This is a power point on plastics , to help us understand what is a plastic , what are the types of plastic and what harm do they cause to our environment

3. In Plastics, the arrangement of the individual
units may be linear or cross linked
Linear or lightly cross-linked polymers form
a class of plastics called thermoplastics
Heavy cross-linking plastics are called
thermosetting plastics

4. THERMOPLASTIC IS A POLYMER
THAT TURNS INTO A LIQUID
WHEN HEATED AND FREEZES
INTO A VERY GLASSY STATE
WHEN COOLED SUFFICIENTLY.