Why is cyanide heap leaching used to extract gold from some deposits?
A) The gold concentration is too low to be extracted using traditional methods.
B) It is safer than other methods.
C) Gold can only be extracted from finely disseminated deposits.
D) It produces fewer mine tailings than other methods.
A
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Based on the daily air quality index released in the U.S., a value of 101 to 150 indicates
A) air quality is satisfactory and air pollution poses little to no risk. B) some pollutants may pose health concerns for unusually sensitive individuals. C) everyone may experience serious health effects from hazardous air conditions. D) the entire population may be affected by the air quality. E) at risk populations may be adversely affected, but the general public will likely not.
Cuba is the largest island in the Caribbean
Indicate whether the statement is true or false
Overwarning is difficult to avoid in hurricane forecasting
Indicate whether the statement is true or false
An afternoon sky full of cumulus humilis clouds with little vertical growth indicates ____ weather
a. stormy b. fair c. cold d. snowy e. rainy