Which of the following best matches the description?Naturally occurring substances that can be extracted under current conditions.
A. surface mining
B. nonrenewable energy sources
C. renewable energy sources
D. resources
E. reserves
F. acid mine drainage
G. underground mining
H. black lung disease
I. passive solar system
J. photovoltaic cell
K. overburden
L. secondary recovery
M. geothermal energy
N. active solar system
O. liquefied natural gas
Answer: D
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