Irrigation has allowed humans to grow crops in areas where natural water supplies have been limited. A major challenge that exists in these areas has been ________
A) soil erosion B) soil salinization C) high pesticide use D) low crop diversity
B
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Why would intrusive rocks chemically weather more quickly than extrusive rocks? Why would mafic rocks chemically weather more easily than felsic rocks?
What will be an ideal response?
One general trend that is indirectly helping developing countries become self-sufficient is
A) the increased production of biofuels. B) decreased reliance on fossil fuels in the production of food crops. C) the outsourcing of manufacturing jobs from the developed to the developing world. D) a dramatic increase in the importation of mineral ores.
Which of the following is NOT a setting in which regional mountain belts form?
A. upwelling of the mantle B. the collision of India with Asia C. passive margin D. subduction zone E. continental collision
Which of the following regions is NOT adjacent to the European region?
a. North Africa b. Middle East c. Russia d. Asia