Keep New Zealand Beautiful Week is 14th-20th September.
This includes Clean Up Events in local areas.
If your school is participating, why not take advantage of these activities to include a bit of science?
The following ARB resources can provide some ideas.
Level 2
Level 3
Levels 3 and 4
Level 4
Level 5
For more information about KNZBW go to http://www.knzb.org.nz/