Slash-and-burn—the name given to an early innovation that enabled the growth of minisystems into early world-empires—refers to an innovation in
A) agriculture.
B) warfare.
C) metal-working.
D) urbanization.
E) colonization.
Answer: A
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Cosmic background radiation refers to
A. redshifted microwave radiation being emitted from the center of the universe. B. the radiation emitted from galactic nuclei. C. pockets of radiation found in certain quadrants of the observable universe. D. uniformly distributed residual radiation that resulted from the Big Bang.
Which of these countries is experiencing the greatest stress from overuse of its surface water?
A. Saudi Arabia B. Great Britain C. Canada D. Brazil
It can be said that coastal habitats are actually
a. increasing in area b. disappearing up to 10 times faster than tropical forests c. maintaining a solid level of biodiversity d. disappearing at the same rate as tropical forests e. declining in many areas but rebounding in others
One significant difference between an ionic bond, where electrons are taken from one atom and added to another atom, and a covalent or metallic bond, where electrons are shared, is ________
A) ionic bonds make a material more malleable than covalent and metallic bonds B) ionic bonds are stronger than covalent or metallic bonds C) ionic bonds produce ions but covalent and metallic bonds do not produce ions D) ionic bonds do not result in the attraction of oppositely charged atoms, but covalent and metallic bonds do