water pollution (chemicals that pollute the water (farmers use…
chemicals that pollute the water
farmers use pertilisers and pesticides,
oil from tanks and pipelines escapes
PCBs these are found in paints on boats, makes paint water proof
treated sewage, contains nitrates and bacteria
fertilizer gets into water
this stops sunlight getting through
when algae die, it is decomposed by bacteria
the bacteria use up the left over oxygen
this means that any animals left die
the use of these chemicals can also create a process of Bio-accumulation.
this means the accumulation of substances, such as pesticides, or other chemicals in an organism.
this is part of the food chain
something at the bottom of the food chain feeds on a plant that has also taken the chemical
then is eaten but something else higher on the food chain
when it gets to the top of the food chain the toxicity of the
chemicals is lethal.
Eutrophication happens this is the process of excess fertilisers causing water pollution