Non-biodegradable waste will NOT
break down (or won't for many many years). Examples are plastics,
metal and glass. Some dangerous chemicals and toxins are also
non-biodegradable, as are plastic grocery bags, Styrofoam
(polystyrene), and other similar materials but will eventually
break down over time.
BIOEGRADABLE: The waste that breaks down easily by
the action of some micro-organism (i.e. bacteria) and also can
break down in a non-poisonous form.