Marine geologists can predict the age of igneous rocks of the sea floor by measuring ________.
A. the velocity of earthquake waves
B. magnetic anomalies
C. their grain size
D. the percent of iron-rich minerals in the rock
E. their density
Answer: B
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Which of the following was NOT a reform that Gaius Marius instituted in the Roman army?
A) Instituting pay for military service B) Requiring troops to purchase and bring their own armor C) Abolishing property requirement for military service D) Reorganizing the structure of the Roman legion into cohorts
The two leading sources of immigrants since the late twentieth century to the United States have been:
A) Latin America and Asia B) Latin America and Africa C) Africa and Europe D) Germany and Asia E) Asia and United Kingdom
Burkina Faso represents a nation in which
A) there is a strong middle class, allowing women to marry later, find employment, and have small families. B) long life spans have produced a large elderly population, supported by good social services. C) many women are illiterate, marry early and have large families, partly because the infant mortality rate is very high. D) medical facilities are excellent, and women are having fewer children because infant mortality has dropped dramatically.
Which of the following is the net ionic equation for the reaction of the strong acid HCl with the strong base NaOH?
A) H3O+(aq) + Cl-(aq) + Na+(aq) + OH-(aq) ? Na+(aq) + Cl-(aq) + 2H2O(l) B) HCl(aq) + NaOH(aq) ? NaCl(aq) + H2O(l) C) H3O+(aq) + OH-(aq) ? H2O(l) D) none of these