Which of the following best matches the description?Layer of soil and rock that covers deposits of desirable minerals.
A. active solar system
B. liquefied natural gas
C. underground mining
D. overburden
E. acid mine drainage
F. surface mining
G. resources
H. reserves
I. black lung disease
J. renewable energy sources
K. nonrenewable energy sources
L. geothermal energy
M. secondary recovery
N. photovoltaic cell
O. passive solar system
Answer: D
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