The greatest danger from pyroclastic flows is ________
A) being buried in ash.
B) not significant because they move so slowly they can be avoided.
C) being incinerated by the hot gas and entrained magma.
D) being smothered by hot gases and ash.
C
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According to the following reaction, which molecule is acting as a base? OH- + NH4+ ? H2O + NH3
A) H2O B) NH3 C) OH- D) NH4+ E) none of the above
The term demographic transition refers to ________
A) the slowing down in the growth of a population as it approaches the carrying capacity B) the decline in death rates followed by a decline in birth rates that occurred because sanitation levels in areas improved C) the decline in death rates followed by decline in birth rates when a country develops a strong economy D) the slowing down in the growth of a population as it approaches its biocapacity E) a requirement for a population to reach a specific size before it becomes stable
The biological pump ________.
A. feeds most life in the ocean B. helps regulate atmospheric CO2 concentrations, depends on photosynthesis, and feeds most life in the ocean C. helps regulate atmospheric CO2 concentrations D. refers to organisms that filter the water for food E. depends on photosynthesis
Judge the following sentence according to the criteria given below: Usually a parasite does not rob enough energy to kill the host BECAUSE if the host dies, so does the parasite
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.