Most flood-related deaths in the United States are caused by flash floods, and about 50 percent of these deaths are vehicle-related.
Answer the following statement true (T) or false (F)
True
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Effectively combating the spread of malaria has become more challenging since the 1970s because:
a. The Anopheles mosquito has become genetically resistant to most pesticides. b. Plasmodium parasites have become resistant to most antimalarial drugs. c. The flea that transmits the disease has become resistant to pesticides. d. None of these answers. e. Two of these answers.
What is the most likely source of sediment collected from an abyssal plain?
a. Biological activity in ocean b. Terrestrial c. Magma d. Mineral deposits at vents e. Spreading centers
Atmospheric sulfur compounds
A) originate primarily from natural sources. B) occur only in the gaseous form. C) occur primarily in the form of sulfur monoxide. D) do not have a role in acid precipitation.
According to the graph's data for lead and MTBE use, from 1970 to 2000 lead emissions ________ and MTBE consumption _________.
a. declined nearly 100%; increased nearly 100% b. declined nearly 50%; increased nearly 100% c. declined nearly 100%; increased nearly 200% d. declined nearly 200%; increased nearly 200%