At the root of all magnetism is
A. tiny bits of iron.
B. ferromagnetic materials.
C. tiny domains of aligned atoms.
D. moving electric charge.
Answer: D
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Which of the following statements describes why wind speed generally increases with height above the Earth's surface?
A. Only the lowest layer of air rotates with the Earth. B. Wind instruments are not accurate at the Earth's surface. C. Friction with the Earth's surface slows the air near the ground. D. Air temperature normally decreases with height.
ONLY one of the following statements about Europe's population demographics is true. Which one is it?
a. Immigrant workers are not needed to maintain the labor pool. b. Europe is now close to having a negative rate of increase. c. Gender roles have remained static despite political changes, so fewer women pursue careers. d. The baby boom that followed World War II has dramatically increased the percent of children.
Thomas Malthus concluded that
A) population increased arithmetically while food production increased linguistically. B) the world's rate of population increase was higher than the development of food supplies. C) so-called "moral restraint" was producing lower crude birth rates. D) population growth was outpacing available resources in every country, according to algebraic calculations. E) crude birth rates must balance crude death rates.
The apparent shift in the position of a nearby star when viewed from extreme points in Earth's orbit six months apart is called ________
Fill in the blank(s) with correct word