Harry Hess proposed that the ________.
A. magnetic poles wander
B. magnetic field reverses
C. the core is liquid
D. continents drift
E. sea floor moves
Answer: E
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The U.S. government is separated into three branches: the legislative, judicial, and executive.
Answer the following statement true (T) or false (F)
Which of the following best matches the description?Synthetic compounds produced for refrigerant gases and cleaning solvents
A. CFCs. B. Carbon dioxide. C. Methane. D. Nitrous oxide. E. climate change. F. greenhouse gases. G. IPCC. H. Kyoto Protocol. I. Greenhouse effect. J. Global warming.
A P wave exhibits ____ motion, whereas an S wave displays ____ motion
a. shear; compressional b. compressional; shear c. secondary; primary d. surface; body e. convective; conductive
Convective cooling cools rocks much more rapidly than heat conduction. Hydrothermal circulation represents convective cooling at ocean ridges and is well known from things like black smokes, but only occurs close to the spreading ridge axis
When geophysicists measure the geothermal gradient in areas along ridges where there is no hydrothermal activity, the thermal gradient is far below what you would predict theoretically, but near hydrothermal vents it is far more than you would predict. Why would this be? A) Organisms growing around hydrothermal vents disturb the thermal properties, insulating the surface, to make an apparent high thermal gradient. B) Most of the heat is carried away by convection as hydrothermal systems, so the average geothermal gradient away from the hydrothermal circulation is depressed. C) The thermal gradient in water represented by the hydrothermal system must be different than the rock, so it is measurement artifact. D) The measurements are incorrect because it is too hot to measure thermal gradient in molten rock.