Features with the violent collisions of tectonic

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features with the violent collisions of tectonic plates and inferring the causes of the information of other features from those results C. Recording data about earthquakes throughout the world and correlating the relative force and duration of those earthquakes with information about their geological environment D. Comparing data about earthquakes that occur in southern Africa’s superswell with data about other types of seismic events that occur there E. Using computer models to estimate the length of time it would take for a hypothetical landmass 1,000 miles across to rise one mile vertically Answer: -------------------------------------------------------------------------------- Q8: In line 10, the author mentions the Himalayan Mountains most likely in order to 5
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A. highlight certain similarities between the southern African superswell and other massive features on Earth’s surface B. identify a feature of Earth’s surface that predates the origins of the southern African superswell C. provide an example of a feature of Earth’s surface that can explained by plate tectonics D. suggest that geophysicists are correct in attributing the sculpting of Earth’s surface to violent collisions between tectonic plates E. give an example of a feature of Earth’s surface that scientists are unable to explain fully Answer: -------------------------------------------------------------------------------- Q9: According to the passage, the computer models referred to in line 86 have had which of the following effects? A. They have confirmed researchers’ doubts regarding the theory that convection within the mantle can lift or lower Earth’s surface vertically. B. They have cast doubt on the validity of plate-tectonics theory as an explanation for the sculpting of Earth’s mountain ranges. C. They have proved geophysicists’ theory that the behavior of seismic waves in Earth’s mantle is related to the temperature of the rock through which they are traveling. D. They have convinced formerly skeptical researchers that rock formations deep in Earth’s mantle below southern Africa could have created the superswell. E. They have confirmed researchers’ speculation that masses of hot rock are buoyant enough to rise to the upper part of Earth’s mantle. Answer: ------------------------------------------------------------------------------------------------------------ Q10 to Q12: Prior to 1965 geologists assumed that the two giant rock plates meeting at the San Andreas Fault generate heat Line through friction as they grind past each (5) other, but in 1965 Henyey found that temperatures in drill holes near the fault were not as elevated as had been expected. Some geologists wondered whether the absence of (10) friction-generated heat could be explained by the kinds of rock com- posing the fault. Geologists’ pre-1965 assumptions concerning heat gen- erated in the fault were based on (15) calculations about common varieties of 6
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rocks, such as limestone and granite; but “weaker” materials, such as clays, had already been identified in samples retrieved from the fault zone. Under (20) normal conditions, rocks composed of clay produce far less friction than do other rock types.
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