Which of the following best matches the description?Pollution in which bacteria convert sulfur in coal to sulfuric acid.
A. geothermal energy
B. reserves
C. underground mining
D. black lung disease
E. acid mine drainage
F. resources
G. passive solar system
H. surface mining
I. renewable energy sources
J. nonrenewable energy sources
K. secondary recovery
L. liquefied natural gas
M. overburden
N. photovoltaic cell
O. active solar system
Answer: E
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Fossil fuels currently supply about 50 percent of the world's commercial energy supplies.
Answer the following statement true (T) or false (F)
In order for an atom to substitute for dominant atoms in a crystal structure, and therefore alter its color, what must occur?
A) The atom must be similar in size to the crystal's atoms. B) The atom must have the same charge as the crystal's atoms. C) The atom must be close in electronegativity values to the crystal's atoms. D) The atoms must be close to each other on the periodic table of elements.
What type of setting does Death Valley represent?
What will be an ideal response?
At today's rate of consumption, the world's known reserves of tantalum will last about ________ more years at today's rate of consumption, but if everyone in the world began consuming tantalum at the rate of U.S. citizens, then it would last for only
________ years. A) 377; 5 B) 129; 31 C) 314; 159 D) 2016; 131 E) 56; 7