Of all communicable diseases, the one currently that causes the most deaths worldwide is
A) tuberculosis.
B) respiratory infections.
C) cholera.
D) malaria.
Answer: B
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What is ozone?
A) a gas consisting of molecules containing three oxygen atoms B) a gas that resides in the stratosphere C) a gas that blocks ultraviolet radiation from reaching Earth D) all of the above
Planet building occurs through the process of ____, which involves the clumping of small particles into larger masses
a. condensation b. coagulation c. secretion d. accretion e. aggregation
Simple pumping gets only about 30% of the oil in a reservoir rock out of the ground. To increase the pumping/recovery rate, what kind of secondary recovery technique can be used?
a. Force the steam into the ground nearby (the steam heats the oil in the ground, making it less viscous) b. Use new drill bits c. Hydrofracturing (or fracking) d. Use a more powerful pump e. Both a and c
The most widespread negative health impact of air pollution is the
A) destruction of the cellular components of the immune system. B) loss of the ability to absorb vital nutrients by the digestive system. C) disruption of the signaling processes of the endocrine system. D) chronic stress that weakens many systems of the body.