Water Filtration September 22, 2008 Goal: You will be able to discuss the importance of a water filtration system. PA Standards: B. Recognize earth resources and how they affect everyday life D. Explain the behavior and impact of the earth’s water systems. Informal Assessment: teacher observation; anecdotal notes; written responses

Video Graphic organizer from Friday on desk Staple, tape, or glue into science notebook

anticipatory

It’s a Water World More than 2/3 planet is water (salt) We need fresh, unsalted water to drink All living things need it to live

Reservoirs Artificial lake called reservoir Water can be pumped to towns/cities Year-round water source

Dirty Water From rivers and reservoirs not clean enough to drink Pollution has to be treated –Put into settling tanks –Here large particles in water sink to bottom –Water passes through filter –Clean water stored, ready to pipe into homes

reservoir

Drinking Tap Water Developed countries take it for granted In other parts do not have running water Walk miles to reach nearest tap/well Human population increases; demand for water increase, too Need to use water wisely

Saving Water No shortage of seawater Desalination plants could help –Very expensive to build and operate Conservation much cheaper

Table Talk: Suppose you are lost in the wilderness, but you discover that there is a reservoir nearby. You know that you can’t drink from it without filtering the water first. How could you make the water safe to drink? Stop and Jot Why is filtering water important?

Fun Facts 3,500,000+ children die each yr from drinking unclean water To produce one gallon bottled mineral water costs 1,000 times the cost of one gallon of tap drinking water A person living in NYC uses about 80 gallons of water; person in Kenya, Africa uses 1.3 gallons