Which was found to be the most economical approach to protect drinking water sources for New York City?
A. Pay landowners to protect watersheds.
B. Build a water purification plant.
C. Pump oxygen into lakes.
D. Spraying herbicides in lakes.
Answer: A
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The most effective antimalarial strategies involve the use of
A) DDT, bed nets, and quick access to drug treatment. B) DDT, immunization, and the drainage of all standing water in a region. C) immunizations, surgery, and a change in diet. D) sterilization of mosquitoes, treatment of mosquito breeding sites, and antibiotics.
Population growth has resulted in
A) increased demand for agricultural productivity. B) higher incomes. C) changes in consumption. D) all of the above. E) none of the above.
Which of the following instruments is used to measure the pressure of a gas sample?
A) an altimeter B) a barometer C) a manometer D) an odometer
Consider a substance that has high heat capacity. As compared to a substance with low heat capacity, when an equal amount of heat is applied to both, the high heat capacity substance will __________.
a. become more salty b. turn to a liquid c. become so viscous that it won't flow d. explode e. heat up much more slowly