In the last 50 years, the greatest progress in addressing worldwide hunger and malnutrition came from the
A) use of better transportation methods to export grain more efficiently.
B) development and use of new varieties of high-yielding wheat and rice.
C) reduced reliance on pesticides, herbicides, and chemical fertilizers.
D) widespread use of sustainable irrigation methods.
B
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Why is the early rock record of the Precambrian rocks more difficult to interpret than the rock
record of the Phanerozoic Eon? What will be an ideal response?
Carbon 14 is useful for archeological samples because it is effective back to approximately
____________________ years. Fill in the blank(s) with the appropriate word(s).
Middle latitude cyclones
A) are essentially two dimensional with little vertical structure. B) are essentially two dimensional with little latitudinal structure. C) are essentially two dimensional with little meridional structure. D) are three-dimensional entities.
The primary force which causes ALL winds is:
A) inertia force. B) pressure gradient force. C) geostrophic force. D) centrifugal force. E) Coriolis effect.