A condition in which the toxin is transferred from one organism to another  as a result of ingesting other plants and animals in which toxins are more widely disbursed.

An excessive richness of nutrients in a lake or other body of water due to runoff from land which causes a dense growth of plant life and death of animal life from lack of oxygen.   

A kind of algal bloom made up of phytoplankton which are sing-celled protists or plant-like organisms. 

These are from the wastewater produced from the processing of mineral ore and are collected in a large catchment area. 

_______________ pollution happens when hot wastewater from industrial or power plants is released in rivers or lakes. 

Thermal pollution makes the water dirty. 

Microorganisms plays an important role the in the natural process of cleaning up water. 

Natural process of self-purification could keep up with the increasing amount of human and animal wastes.

Abundance of nitrates and phosphates in lakes and rivers results to an excessive growth of algae. 

Many of our rivers have been identified as dead rivers. 

The water pollutant considered to be highly toxic to humans.

A condition in which water becomes unfit for its intended use.

It refers to a liquid waste or sewage discharged into a river or sea. 

ODW means ______.

It refers to  bodies of water which could no longer support important aquatic species due to the depletion of oxygen and the deterioration  of its natural conditions.