During Treatment of Water to Make It Potable, About 90

question 20

Multiple Choice

During treatment of water to make it potable, about 90% of the microbes are removed

• A) in the sedimentation step.
• B) by treatment with chlorine or ozone.
• C) in the filtration step.
• D) by preliminary fermentation.
• E) by treatment with biosensors.

---

Definitions:

Low-Wage Jobs

Positions that offer compensation at the lower end of the pay scale, often not sufficient to meet the basic living expenses of the worker.

Free Black Workers

Denotes African American individuals who were not enslaved and worked for wages or owned their businesses, notably before and after the Civil War in the United States.

Fugitive Slave Act

Legislation passed in 1850 that required the return of escaped slaves to their owners and imposed penalties on anyone who aided in their flight, intensifying antislavery sentiments.

Escaped Slaves

Individuals who fled from slavery to seek freedom, often traveling long distances and facing significant dangers.