Common examples of sulfide and sulfate minerals, respectively, are:a
galena and pyrite.
b. gypsum and anhydrite.
c. galena and gypsum.
d. galena and hematite.
e. fluorite and pyrite
C
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What causes the constant direction of the northeast trade winds?
A. Earth's rotation B. unequal heating at the poles C. solar energy D. cold air from the poles
Limestone is mostly composed of the mineral quartz. Indicate whether the statement is true or false
HIPPCO is an acronym that aids in remembering ____.
A. the names of extinct species B. African animals that are threatened with extinction C. threats to the world's biodiversity D. the names of international treaties dealing with endangered species E. the organizations working toward saving threatened species
Which of the following statements about chronic vs. acute exposure is TRUE?
A) A person has experienced acute exposure if the exposure was at high levels for a long period of time. B) Acute exposure to a toxicant is more difficult to study than chronic exposure. C) Chronic levels of a toxicant are assessed for individuals with chronic conditions such as arthritis. D) A person getting an x-ray is experiencing chronic exposure to radiation, whereas the radiologist is trying to minimize levels of acute exposure. E) Safe levels for chronic exposure to a toxicant are lower than safe levels for acute exposure.