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