Although industrial agriculture has greatly reduced world hunger and malnutrition, it has ________
A) doubled the amount of land used to raise crops
B) required high levels of fertilizer and pesticide use
C) not significantly increased the productivity of modern agriculture
D) contributed significantly to the destruction of the ozone layer
B
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What is the evidence for Earth's central core being solid?
What will be an ideal response?
The factors that prevent unlimited population growth are known as limiting factors.
Answer the following statement true (T) or false (F)
Wind-blown dust-sized particles of silt and clay can settle out to form thick blankets of sediment called _____ that may cover or bury the existing topography over widespread areas
a. barchans b. seif c. deflation hollows d. loess e. clay pan
Why isn't manganese mined on the seabed when there are abundant manganese nodules in some parts of the ocean floor?
A) The manganese market is held by a global cartel who prevent the material from being mined. B) It is not economical to mine manganese nodules at present-day world prices for manganese and associated metals in nodules. C) The manganese is too difficult to extract from the nodules; a new technology is needed. D) It is impossible to extract the nodules from the seafloor with present-day technology.