Where do the toxic gases and leachates come from that are the result of mining for gold?
A. Sulfur compounds in the ore
B. Heavy metals used in the operation of mining for the gold
C. Chlorine compounds in the ore
D. Cyanide used in the operation of mining for the gold
E. Carbon compounds in the ore
Answer: A
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All of the following are benefits of organic farming and crop rotation as a sustainable agriculture method EXCEPT
A. it typically requires less water. B. it requires the use of few or no pesticides. C. it can best help large-scale farmers. D. it can spread out the risk of crop failure.
The mass of an atom of 12C is exactly 12 atomic mass units. Which of the following describes a mole of 12C atoms?
A) a sample which contains 6.02 x 10^23 atoms of 12C B) a sample which weighs exactly 12.011 grams C) both a and b D) neither a nor b
Which of the following is NOT a typical hazard posed to human-made structures by lava flows?
A. crushing B. high winds C. burning D. burying
Wind-blown sand may sculpt isolated pebbles, cobbles, or boulders into ________.
A. ventifacts B. sand dunes C. desert road D. desert pavement E. desert varnish