The inner core is believed to rotate independently from the outer layers of Earth. Why is this possible?
A) The immense interior pressures generate rotation.
B) The inner core is separated from the mantle by the liquid outer core and can spin freely.
C) Radioactive decay generates spin.
D) Frictional drag pushes the inner core at a different rate than the rest of the planet.
Answer: B
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Core regions usually have a higher per capita income than do periphery regions
Indicate whether this statement is true or false.
The relative direction and average rate of plate movement can be calculated using ____
a. accreted ophiolite studies b. hot spots c. subduction rate measurements d. magnetic anomalies and satellite-laser ranging e. spreading ridges
As part of the triangular slave trade system, ships bound for Europe carried
A) cloth and trinkets. B) rum and molasses. C) slaves. D) gold and silver. E) All of the above.
Salinization is a common agricultural problem in what type of region?
A. Windy B. Arid C. Tropical D. Cold E. Humid