Which of the following best matches the description?Known deposits from which materials can be extracted profitably under current economic and technological conditions.
A. nonrenewable energy sources
B. photovoltaic cell
C. acid mine drainage
D. surface mining
E. geothermal energy
F. overburden
G. resources
H. renewable energy sources
I. liquefied natural gas
J. active solar system
K. reserves
L. underground mining
M. passive solar system
N. secondary recovery
O. black lung disease
Answer: K
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Susan is conducting an experiment to see if plants will grow better with application of fertilizer. She separates 50 plants into two groups of 25. One group receives a liquid fertilizer when watered every other day, and the other group receives only water on the same days. The plants are kept in a greenhouse with constant and equal amounts of sunlight, and a constant temperature. She measures the plants once a week for 12 weeks. At the end of 12 weeks, the plants with the fertilizer grew an average of 9 inches, and the ones that were not given the fertilizer grew an average of 5 inches.When referencing the above scenario, why did Susan average the resulting heights of the plants?
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