I could be wrong, but the main water monitoring things are Flocculation, filtration, Sedimentation...maybe those words will help in ur search...also, visit
http://www.sydneywater.com.au/html/your_water/yourwater_index.cfm
that might help :)
Oh, go here...
http://www.pascalpress.com.au/
There the copany that publish the Excel books, look on their "English" list and see if theres a Gwen Harwood one.
I think what its asking is to point out that some texts becoming irrelevant. for example, if some text was written about a topic that has no relevance to todays society, then it could be said that the text has reach its 'use-by date'.
Of course you could argue that there are some texts that...
does any know if the new syllabus has come out for physics/chemistry/biology. i cant find it on bos...if it hasnt come out, does anyone know when it will? :confused: