How much more organic carbon would be saved annually by using reduced tillage?
a. 70 kg/ha
b. 7,000 g/ha
c. 120 kg/ha
d. 12,000 g/ha
Answer: a. 70 kg/ha
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When did the ice-free corridor open in North America, allowing a path for human migration from Asia?
A) 12,500 years ago B) 9,000 years ago C) 100,000 years ago D) 7,500 years ago
The number of electrons delivered daily to an average American home by an average power utility in the mid-1980s was
A) zero. B) 110. C) 220. D) billions of billions. E) none of the above
Which of the following is true of a buffer prepared with equal concentrations of an acid and its conjugate base?
A) The buffer capacity depends on the concentration of the acid and base B) The pH depends on the concentration of the buffer C) both a and b D) neither a nor b
Some anticyclones move into the midlatitudes from northern Canada in what are called _______________ of frigid continental polar air. (two words)
Fill in the blank(s) with correct word