Hoffmannfiles

Another excellent Edublogs.org weblog

Algal blooms in Lakes and Rivers

Answer need to talk about Nitrogen, phosphorus, Oxygen and Carbon.

Here are some handy websites:

Green algae

http://www.watercare.net/wll/himp-algalblooms.html

Blue green algae

http://www.science.org.au/nova/017/017key.htm

http://en.wikipedia.org/wiki/Cyanobacteria