Subduction zones are downgoing convection cells in the earth but only carry oceanic material into the mantle
Indicate whether the statement is true or false
TRUE
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Shield volcanoes commonly involve
A) fluid lava flows. B) volcanic domes. C) viscous lava flows. D) pyroclastic flows. E) All of these are correct.
Geologists in the early 1900s concluded that heat flow through continents should be greater than heat flow through ocean floors. Evaluate this hypothesis
A) True. The granite of the continental crust contains more radioactive elements than the basalt of the ocean floor, so more heat is produced in continental crust. B) True. Continental crust is thicker than ocean crust, so more heat is produced in the thicker layer. C) False. The lithosphere is thinner beneath oceans than continents, so heat flows more easily up from the mantle. D) False. The basalt of the ocean floor has a better insulating quality than continental crust granite.
Which type of commercial agriculture accounts for the most farm acreage in the NE U.S. and NW Europe and accounts for 20% of the total output by value of commercial agriculture?
A) mixed crop and livestock farming B) dairy farming C) grain farming D) cattle ranching E) Mediterranean farming
In a ________ fault the hanging wall block moves down relative to the footwall block.
A. strike-slip B. normal C. compressional D. thrust E. reverse