1a) 2 properties that glass and plastic always share
1b) 2 properties that glass and plastic sometimes share
2) what advantages do bottles made from plastic have?
3) what disadvantages are there when you use plastic bottles?
4) why are plastic bowls not used for heating on a cooker?
5) what are the disadvantages of using metal for a toy for a baby?
6) why is plastic often used for children's toys?
7) what properties would you look for in materials to make a kite?