Learn English Lesson # 4 (Read the discussion of issues of study)
Questions:
What are the problems of spring water?
Nitrate in agricultural drainage water potential.
What are the benefits of spring water?
It contains essential minerals.
What is reverse osmosis filter to do?
Removes unwanted particles and leaves of pure water.
List three minerals.
Magnesium, selenium and iron.
Name three items harmful in the water.
Fluorine, mercury and lead.
Learn English Lesson # 4 (Read the discussion of issues of study)
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