Rationale and Objectives
About three quarters of the earth's surface is covered with water. Most of the water (97.5%) is ocean, another 2% is locked in glacial ice and the remaining 0.5% is fresh water found in rivers, streams, lakes and the groundwater system.
Although water resources have always been thought as being renewable, since the advent of the industrial revolution and especially during the last couple of decades, the earths water supply is going through a process of degradation.
In this unit, in order to develop students' civic responsibility towards the deteriorating situation of our water supplies, they should be able to understand the causes and effects of water pollution.