river testing infographics

River testing 

At camp we studied on testing a river we used a tube that showed if the river was not dirty or was dirty. You moved a magnet forwards or backwards to make it work.This info graphic shows what you had to do ,well not like mine though this is a example 
                          

You needed to add information that you learnt about river testing,I did draw a drain that lead into the river because It would tell you whatever rubbish you leave on the ground any drains lead into a river and rubbish can fit through drains  pollute,clog and stink up the river .

There's probably something you have learnt.