8.23: Earth's Fresh Water- Challenge 4
- Page ID
- 5461
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- 1. Nutrients, such as ___ in fertilizer, promote algae growth in water.
- nitrates
- 2. Radioactive substances, heavy metals, and oils are examples of ___.
- industrial pollution
- 3. One indicator of aquatic health is BOD levels, which measure biological oxygen demand. Healthy systems have low BOD levels. A high BOD level indicates ___.
- a highly polluted system due to a scarcity of oxygen and an excess of nutrients (especially nitrates)
- 4. While treating drinking water, chemicals are added to make solids in the water clump together in the process of ___.
- coagulation
- 5. In water treatment, ___ is the process of removing smaller particles from the remaining liquid.
- filtration
- 6. The first step of wastewater treatment is ___.
- removing the large and small particles
- 7. In coastal areas, groundwater mining ___.
- increases groundwater salinity
- 8. The ___ region of the U.S. has intense droughts and reduced groundwater levels.
- South
- 9. In coastal areas, when aquifers get low, ___ may intrude.
- salt water
- 10. Which of the following can pollute groundwater: landfills, hydraulic pumping operations, or mining operations?
- All of these activities can pollute groundwater
- 11. While analyzing groundwater contamination, scientists focus on ___.
- the site's geology, the nature of the contaminants, and the soil characteristics
- 12. Cleaning an aquifer does no good if you do not also ___.
- eliminate the pollution source
- 13. ___ involves injecting microorganisms into contaminant plumes and allowing them to consume pollutants.
- Bioremediation
- 14. Bringing toxic materials to the surface does not solve the problem of ___.
- disposing them cleanly and safely