A pound of ordinary bituminous coal typically contains ________ percent carbon.

A. 10
B. 90 to 95
C. 5
D. 45 to 86
E. 100


Answer: D

Environmental & Atmospheric Sciences

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Indicate whether the statement is true or false

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The term demographic transition refers to ________

A) the slowing down in the growth of a population as it approaches its biocapacity B) the decline in death rates followed by a decline in birth rates that occurred because sanitation levels in areas improved C) a requirement for a population to reach a specific size before it becomes stable D) the slowing down in the growth of a population as it approaches the carrying capacity E) the decline in death rates followed by decline in birth rates when a country develops a strong economy

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Volcanoes are triggered by

A) changes in solar radiation. B) movement of tectonic plates. C) human mining activities. D) major changes in climate.

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