In two well-developed paragraphs, explain how water is treated so that it can be used for safe drinking water. Include definitions of the terms potable and pathogens.

1. In two well-developed paragraphs, explain how water is treated so that it can be used for safe drinking water. Include definitions of the terms potable and pathogens.
2. In two well-developed paragraphs, name and describe the five primary air pollutants and provide several sources of each.
3. In two well-developed paragraphs, list the populations that are affected by ultraviolet light and identify the effects on each of these populations.
4. In two well-developed paragraphs, describe three or more of the six major ways in which humans use land.

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