The assessing the benefit of providing improved sanitation and safe water to the public involves
A. Placing a value on the time needed to travel to obtain water.
B. placing a value on health care cost to treat diarrheal diseases.
C. placing a value on the number of workdays lost due to illness.
D. All of the options listed are involved.
Answer: D
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Upwelling areas are ____
A) only found near the equator B) usually nutrient poor C) sometimes depleted of nutrients during El Niño years D) not affected by Ekman transport
What two factors influence seawater density? Which one has the greater influence on surface seawater density?
What will be an ideal response?
The discovery that the universe appears to be expanding led to a widely accepted theory called ________
A) Hubble's Law B) Einstein's Law C) the Doppler effect D) the Big Bang
Hot spots form linear island chains because
A. they occur along the mid-oceanic ridges. B. they are aligned with trenches formed by subduction. C. the plate moves relative to the underlying hot spot.