a) TLW practice drawing the components of the four major nutrient
b) TLW question how these cycles have been affected by human
Jerrod Diamond : Human impacts on the environmenthttp://www.ted.com/talks/lang/en/jared_diamond_on_why_societies_collapse.html
Divide the class into four groups. Divide the blackboard into four
sections, each labeled with a different cycle—nitrogen cycle,
phosphorus cycle, sulfur cycle and carbon-oxygen cycle.