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geo directory

Some of these questions must be answered by consulting your textbook which correlates with the video series.  Consult: "Physical Geology -Earth Revealed" by Carlson, Plummer and McGeary; published by McGraw Hill, New York City, NY


5. The Birth of a Theory 
 In the 1960s, earth scientists developed the theory of plate tectonics. This program traces the development of plate tectonics, beginning with the contributions and methods of geologist Alfred Wegener. Sea-floor spreading, continental drift, paleomagnetism, and the primordial supercontinent Pangaea are some of the topics covered.

Episode 5: The Birth of a Theory

What is the theory that states that the earth’s crust is divided into moving plates?

Who was Alfred Wegener? p. 77

What did Wegener list as evidence for continental drift? p.78, 79

What is Pangaea?

What are the names of the two parts of Pangaea? p. 78

Wegener’s climatological data showed that Eastern US was equatorial (tropic) in the late Paleozoic (Permian).  Where was the north pole at that time? p. 79

What is it called when the poles move about the earth? p. 79

According to recent paleomagnetism studies, do the poles wander? p.81

What was the problem with Wegener’s proposal that caused scientists to reject it for over a half century? p. 80


What is sea floor spreading?


What technology developed during WW II gave credibility to the theory?


What is "subduction?"


What are deep sea features are formed at subduction zones?

How did the cores drilled by the Glomar Challenger help verify sea floor spreading?


How does convection relate to plate tectonics? p.82

When did Pangaea split apart? p. 82


How did a study of "Magnetic Field Reversals (anomolies)" support seafloor spreading? p. 86


What are "Transform Faults?" p. 88

link to answers (this will not be an active link until after the assignment due date!)