Learn English Lesson #4 (Read + Speak + Study Questions) - YouTube


Learn English Lesson #4 (Read + Speak + Study Questions)





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Uploaded on Jul 25, 2010

Is bottled water better than tap water? Is tap water worse than spring water? Is store-bought water better than spring water? These three questions are excellent. Let's analyse the data. Water needs to have purity. Purity means the water does not contain unwanted harmful ingredients such as mercury, lead, arsenic, fluoride, aluminium, chloramines or agricultural nitrates. Pure water should only contain helpful minerals such as magnesium, calcium, iron, zinc, manganese and selenium. The highest quantity of these essential minerals can be found in spring water. Some people are scared about ingesting spring water because of possible high nitrate levels; Nitrates from agricultural runoff (fertilizers and manures) is a health hazard and should be avoided. But natural nitrates pose no risk. Many people purchase purified water from a store. This water starts out as tap water. A reverse osmosis filter removes all particles and leaves pure water in place. The problem with purified water is the source: tap water. Tap water is often recycled wastewater or lake water that is full of unwanted substances. So what is the verdict? Clean spring water is the best!

What are some problems with spring water?
Possible nitrates from agricultural runoff.
What are some benefits of spring water?
It contains essential minerals.
What does a reverse osmosis filter do?
It removes unwanted particles and leaves pure water.
List three helpful minerals.
Magnesium, selenium, and iron.
List three harmful substances in water.
Fluoride, mercury and lead.

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