Which of the following best matches the description?System that traps sunlight energy as heat energy and uses machines to move it.
A. underground mining
B. resources
C. secondary recovery
D. renewable energy sources
E. liquefied natural gas
F. nonrenewable energy sources
G. overburden
H. surface mining
I. passive solar system
J. acid mine drainage
K. active solar system
L. black lung disease
M. reserves
N. photovoltaic cell
O. geothermal energy
Answer: K
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