Unlike developed countries, children in developing countries often die from ________
A) snakebites or attacks from large predators such as crocodiles and tigers
B) common ailments such as diarrhea
C) accidents involving farm equipment and other agricultural activities
D) hunting accidents
B
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Radioactivity is a tendency for an element or a material to
A. radiate heat. B. emit radiation. C. glow in the dark. D. emit light. E. emit electrons.
Why are combustion reactions generally exothermic?
A. Hydrogen easily pulls electrons from the oxygen in water molecules and is reduced. B. Combustion involves the transfer of electrons to oxygen, which has an extremely high tendency for gaining electrons. C. During combustion, oxygen is oxidized, which gives off lots of energy. D. It is highly exothermic because combustion involves an oxidation-reduction reaction between a metallic material and oxygen.
The terminal velocity of an object depends primarily upon:
A) its composition. B) its shape. C) its size. D) the temperature.
Although the jigsaw-puzzle fit of the southern continents was noted, opponents of continental drift argued that, even if continental displacement had occurred,
a good fit between the continents today would be unlikely. What geologic evidence did they cite to support this claim? A) Deposition in river deltas had changed the longshore current, resulting in erosion. B) The tensional stress of splitting sheared the continents beyond all repair. C) Wave erosion and coastal deposition have changed the shape of the continents. D) Fissure eruptions along continental margins had created new land.