In developed countries, the most recent increases in agricultural productivity have come from
A. New crop varieties
B. An increase in the land being used for agriculture
C. Irrigation, increased fertilization, and new crop varieties
D. Increased fertilization
E. Irrigation in arid areas
Answer: C
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For the following reaction, identify whether the compound in bold is behaving as an acid or a base. H3PO4 + H2O ? H2PO4- + H3O+
A. acid B. base C. neither D. both E. none of the above
Listed from Earth's center outward, the major divisions of Earth are
a) crust, mantle, outer core, inner core b) mantle, crust, outer core, inner core c) inner core, outer core, crust, mantle d) outer core, inner core, mantle, crust e) inner core, outer core, mantle, crust
This region was Europe's fastest-growing manufacturing area during the late twentieth century
A) Northeastern Spain, centered on Barcelona B) Western Portugal, centered on Lisbon C) South-Central Germany, around Munich D) Southern United Kingdom, near the English Channel E) Western Russia, centered on Moscow
The hydrogen atoms in a water molecule tend to bond to ____
A) each other B) oxygen atoms of another water molecule C) hydrogen atoms of another water molecule D) all positively charged ions