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The main focus of the topic is water. It is mentioned in the introduction of the lesson that the planet Earth consists of 70% to 80% of water, but therefore this doesn't mean that all that water can be consumed and be used by human beings. Refer to FAST FACTS to see where water is distributed in various percentages. The above facts then make it clear that water is a scarce resource, so we therefore need to know measures of preserving it. there are instances whereby water is contaminated and cannot be used to drink; this water can then infect people with waterborne diseases, there are therefore ways to purify that kind of water to prevent waterborne diseases.
 * __Water Preservation and Purification__**

The term used for water that is contaminated is called water pollution