Evaluate the use of dumps, sanitary landfills, and modern secure landfills in disposing of waste. In your evaluation provide the pros and cons and the context for which each disposal method would best work.
What will be an ideal response?
Open dumps: Pro - cheap, no planning involved, easy to use Con - non-regulated, unstable-may collapse, groundwater contamination, smells terrible These types of dumps are mainly found in developing countries where technology and/or money is not available for other means of waste disposal. Sanitary landfills: Pro - waste regulated and controlled, covered w/dirt to decrease smell, convenient, relatively inexpensive, can be used to capture methane and generate electricity Con - sometimes located on permeable or faulted rock formations, possible groundwater contamination, suitable sites becoming scarce Works best in areas with sufficient land area-away from large populations, built in impermeable and stable geologic regions with little or no threat to groundwater contamination. Secure landfills: Pro - allow disposal of toxic waste, liner prevents groundwater contamination Con - transportation of hazardous waste to disposal sites is the greatest concern because of the chance of accidental chemical spill (especially in urban areas), financial responsibility of abandoned waste sites (must be maintained for many years after being filled), best in areas with large amounts of hazardous wastes that need to be disposed of, would be best located away from urban areas.
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An Alka-Seltzer antacid tablet bubbles vigorously when placed in water but only slowly when placed in an alcoholic beverage of the same temperature containing a 50:50 mix of alcohol and water
Propose a probable explanation involving the relationship between the speed of a reaction and molecular collisions. A) The alcohol absorbs the carbon dioxide bubbles before they escape the liquid phase. B) Alcohol molecules are more massive than water molecules, hence they move slower and their collisions are not as forceful. C) The tablet reacts with water but not the alcohol. D) In a 50 : 50 mix there are fewer water molecules for the antacid molecules to collide with.
What is the main problem facing Ogallala aquifer?
a) overpumping may cause southern parts of the aquifer to go dry in the next 100 years b) it has become contaminated with radioactive waste from the Chernobyl accident c) precipitation is heavier to the east, causing tilting of the entire formation d) leakage from chemical processing plants are polluting the entire aquifer e) the groundwater is becoming more salty from water from the pacific Ocean
In effect, the solar energy stored by plants during their growth is ________ when they are burned.
A. used to produce ozone B. returned to their roots C. stored in ribosomes D. lost forever E. returned to the atmosphere
Most geologic resources are renewable.
Answer the following statement true (T) or false (F)