To rocket from Earth to the Moon requires a speed
A. at any sustained speed if time isn't a factor.
B. at least that of escape speed from Earth.
C. more than escape speed from Earth.
D. none of the above
Answer: A
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The six major continents at the beginning of the Paleozoic were _______, ________, _______,
_______, _______, and _______. Fill in the blank(s) with the appropriate word(s).
Ammonites were one of the major groups of Mesozoic marine fauna to go extinct at the end of
the Cretaceous. Indicate whether the statement is true or false.
Geographers might characterize a country as overpopulated when
A) there are too many people according to a standard economic measure of poverty. B) the population numbers less than one million, but there is concern that the country's natural resources are adequate for only half that number. C) the population numbers more than 100 million and while there is concern about the finite limits of natural resources, they have been adequate historically. D) the population numbers more than one million, and there is an average distribution of population to resources. E) the population numbers more than 100 million and migration contributes 1 million annually.
Malaria is widespread in tropical and subtropical regions, with some 525 million cases occurring annually and resulting in one to three million deaths, mainly in young children:
A. of the Jesuits in Europe. B. of the Quechua Indians in Peru. C. in Sub-Saharan Africa. D. of the pilgrims in Massachusetts.