Smelting ore, as in Ducktown, Tennessee, releases toxic chemicals in the form of
A. Dust, from grinding ore gravel
B. Solids, in the form of toxic waste
C. Gases, from baked ore
D. Liquids, from leaching processes
E. All of these are correct
Answer: C
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Which is the effect of lower prices for a mineral commodity?
A. It encourages less waste of the resource. B. It spurs exploration for new deposits. C. It convinces buyers to use less. D. It encourages exploitation of lower grade deposits.
Neurons that carry messages from the central nervous system to muscles or organs are
A) sensory neurons. B) interneurons. C) motor neurons. D) both B and C
This cross section shows the location of 5 wells and the water table. Which well is most likely to be an artesian well?
A) Well A
B) Well B
C) Well C
D) Well D
E) Well E
Which of the gases listed below has accumulated in the atmosphere as a result of biological processes?
A) 1argon B) oxygen C) nitrogen D) water vapor