The United Nations predicts that over the next 40 years global food production will need to increase ________ percent in order to prevent massive famine.
A. 90%
B. 10%
C. 30%
D. 70%
Answer: D
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The main source of power for steam engines and blast ovens is produced from
A) iron ore. B) biomass fuels. C) wood. D) coal. E) dross.
Which of the following best describes desertification?
A) A natural process of succession that cycles from deserts to prairies to forests to deserts B) The formation of dryland ecosystems in regions where temperatures have increased C) The natural movement of deserts advancing into new regions due to shifts in wind direction D) Often the result of topsoil erosion leading to a permanent reduction in productivity
Beaches gain sand under severe, high-energy winter waves and lose sand under the milder, low-energy summer waves.
Answer the following statement true (T) or false (F)
Which horizon contains partly weathered parent material?
a. A b. B c. C d. E e. O