According to GLASOD, the main risk of continuing degradation of agricultural land is
A) an increasing need to rely upon irrigation.
B) declining agricultural productivity.
C) the need to shift from grain crops to soybeans.
D) the need to rely increasingly on herbicides and pesticides.
B
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The most popular form of birth control in poor countries is
A) sterilization. B) birth control pills. C) abortion. D) intrauterine devices. E) abstinence.
Who proposed the dynamic theory of tides?
a. Isaac Newton b. Pierre-Simon Laplace c. Galileo d. Pytheas e. Daniel Bernoulli
Which of the following gives the CORRECT sequence of layers in Earth, from the surface to the center?
A) Crust, mantle, outer core, inner core B) Crust, inner core, mantle, outer core C) Mantle, crust, inner core, outer core D) Inner core, outer core, mantle, crust
Although mustangs are not native to the United States, they exist in several western states on federally owned land. As an introduced species, what should be done with them?
a. As an exotic species, they should immediately be removed and adopted or killed. b. Although they are an exotic species, they are part of our heritage and should be allowed to stay. c. They have been here so long, we should just leave them alone. d. Many countries eat horse flesh, so we should round them up and export them to horse-eating countries.