Which of the following factors are represented by the "P" and "E" in Thornthwaite's P/E ratio?
A. potential sunlight and energy
B. precipitation and energy (available)
C. potential sunlight and evaporation
D. precipitation and evaporation
Answer: D
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Using the data in this table, calculate the number of half-lives that have passed for the granite (unit G on this table)?
A) 1
B) 2
C) 3
D) 4
E) 5
Which of the following is NOT a typical environment in which a sedimentary rock forms?
A. river channels B. heating next to a magma C. beside glaciers D. shoreline of a lake E. deep seafloor
Over the past 12,000 years, the greatest loss of biological wealth has resulted from the
A) conversion of natural ecosystems to modern agriculture. B) movement of human products down rivers and across oceans. C) extraction of oil and mineral from reserves buried deeply underground. D) use of deep aquifers, lakes, and rivers as sources of freshwater.
In order for livestock to be considered organic, ________
A) animals must be reared under natural conditions in intact ecosystems B) animals must be fed 100% organic agricultural feed C) no vitamins and mineral supplements can be used D) hormones and antibiotics are permitted, but not vaccines E) animals cannot be transferred from regular treatment to organic standards