Scientists generally agree that our early (hominid) ancestors evolved from an area in ________
A) Central East Africa
B) Central West Africa
C) Centra Europe
D) Tigris and Euphrates Rivers
E) Nile Valley
Answer: A
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Define "slivers" from an overlay operation.
What will be an ideal response?
Methane
A) concentrations in Earth's atmosphere are not increasing. B) is a poisonous gas. C) is less abundant in Earth's atmosphere than CFCs. D) concentrations in Earth's atmosphere have nearly doubled since 1840. E) is more abundant in Earth's atmosphere than carbon dioxide.
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.
In winter, freezing water can break pipes and even crack engine blocks.Why does this happen?
A) Water expands in volume as it freezes. B) Ice is denser than water. C) Water contracts as it cools and freezes. D) It occurs because of the latent heat of fusion.