A sizeable percentage of the population of the former British colonies of Trinidad and Tobago and of Guyana claim ancestry from which region?
A) South Asia
B) West Africa
C) China
D) United States
E) Australia
A) South Asia
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Which of these methods used to deal with hazardous wastes can produce dioxins? Dioxins are one of the most toxic chemicals known to science.
A. incineration B. physical detoxification C. biological detoxification D. chemical detoxification
Oceanographers and seismologists further explored the theory of continental drift during the early- to mid-twentieth
century by correlating patterns of earthquakes and ____. a. volcanoes b. fault lines c. isostatic equilibrium d. tectonic plates e. convection currents
A solution with a pH of 3 is ________
a. acidic b. slightly alkaline c. strongly alkaline d. neutral
After the drought of the 1930's farmers in the Great Plains were encouraged to plant rows of trees across fields to decrease soil erosion. How would this reduce soil erosion?
a. The trees had no effect; they were just used to improve the land appearance after the great depression. b. The trees can serve as windbreaks to slow wind erosion. c. Tree roots would retard runoff and prevent erosion. d. The trees helped shade the ground, retaining moisture.