What hindered the acceptance of the continental drift theory?
a. There was no evidence of tropical plants ever existing in currently cold areas.
b. The explanation of centrifugal effect as the driving force behind the continents moving.
c. The discovery of similar fossils found on different continents.
d. The general shape of the continents.
ANS: B
Alfred Wegener believed the continents were slung toward the equator due to a combination of the
Earth spinning and tidal drag. This was not a sufficient enough explanation for the acceptance of
continental drift. Later it would be discovered that seafloor spreading and plate tectonics would
explain the force of his theory. Information can be found in the section Pieces of Earth's Surface Look
Like They Once Fit Together.
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If you were able to read Roger's Book, you would be reading about ________.
A. the recreation of the Egyptian Ptolemy's geographical work B. Idrisi's collection of information collected for the first world map C. the philosophical narrative arguing for the existence of geography D. the process of creating the lines of longitude and latitude for the first map of the world
Harry Hess proposed the theory of seafloor spreading, the creation of new oceanic crust
at mid-ocean ridges. Indicate whether the statement is true or false.
What happens to existing oceanic crust as magma extrudes and solidifies at an oceanic ridge?
A) The crust melts because of the intense pressures at the volcanically active zone. B) The crust breaks in half and moves away from the ridge. C) The crust crumples as it encounters resistant, older and cooler rocks on either side of the ridge.
The most abundant silica volcanic rock is __
Fill in the blank(s) with the appropriate word(s)