What percentage of Brazil's motor vehicles currently run on ethanol or ethanol-gasoline mixtures?
A. 5%
B. 15%
C. 30%
D. 45%
E. 75%
Answer: D
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The difference between active and passive remote sensing systems is that
A) active systems involve the latest generation of satellites while passive systems use signals from older satellites. B) active systems include aerial photography while passive systems rely on satellite imagery. C) active systems can operate throughout cloud or fog cover while passive systems require clear sky conditions. D) active systems emit their own energy while passive systems simply detect existing energy signals.
Lines on a weather map connecting points of equal temperature are called isotherms. Indicate whether the statement is true or false
Which compound is least likely to be washed downward from the A horizon?
A) silicate minerals B) organic matter C) potassium crystals D) magnesium minerals
According to Malthus, population grows:
a) incrementally, in “fits and starts.” b) at a steady, measured pace. c) arithmetically. d) exponentially.