recycling material is a concept or way of life that can save our planet. to know when you must recycle something you can look for the symbol that shows that that product can be recycled.

examples:
the symbol on the second picture tells us that this material is made of polyproylene which has a low density, strong and resistant to chemicals. this is a packet of biscuits.

the other pictures has different symbols like picture 5 which is high density polyethelene, which has good stiffness and has a resistance to chemicals.

picture 4 is a plastic that is a combination of one or more resins.