The type of volcanic eruption shown in this photograph is
A) a lava fountain.
B) collapse of a volcanic dome.
C) a fissure eruption.
D) a pyroclastic column.
E) a volcanic mudflow.
D) a pyroclastic column.
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Why are lahars so dangerous?
A) They are the hottest of all lava flows. B) They contain deadly chemicals. C) Hot pyroclastic fragments melt ice and snow; this mixture flows extremely fast. D) They are the most explosive of all volcanic eruptions.
Transportation is the source for 77 percent of this pollutant
A) carbon monoxide B) nitrogen oxides C) sulfur dioxide D) volatile organic compounds
Developed countries have primarily converted from biomass fuel to
A) solar energy. B) fossil fuels. C) wind energy. D) renewable energy. E) animate power.
If the precautionary principle had been applied to the evidence of the dangerous health effects of smoking tobacco from the 1950s to the 1970s,
A) we would still be waiting for the final word and no government actions would have been taken. B) tobacco companies would have been given much more time to research the health effects before any government regulations were passed. C) cigarette manufacturers would have been required to demonstrate by acceptable scientific procedures that smoking was safe and government regulations would have come much earlier. D) more tobacco products would have been sold.