COMPLETE QUESTIONS AND CORRECT DETAILED
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All of the earth's ocean basins are ________. - CORRECT ANSWER- less than 200 million years old
In Wegener's time, scientists thought that the occurrence of fossils of the same organism in two
different, disconnected continents was proof that ________. - CORRECT ANSWER- There had
once been land bridges separating the continents
What was the main view how the world worked geologically prior to the 1960s? - CORRECT
ANSWER- It was generally believed that mountains were produced by vertical force
Alfred Wegener developed the theory of Plate Tectonics. (t/f) - CORRECT ANSWER- false
Some iron-rich minerals will align themselves with the existing magnetic field when they cool
from a magma. (t/f) - CORRECT ANSWER- true
The major driving force of Plate Tectonics is ________. - CORRECT ANSWER- Subduction of cold ,
dense lithosphere
Plate Tectonic boundaries were first identified by ________. - CORRECT ANSWER- mapping
earthquakes and volcanoes
,An identifying characteristic of convergent boundaries is ________. - CORRECT ANSWER- Deep,
linear trenches in the seafloor
Continental rocks do not rift because they are too thick. (t/f) - CORRECT ANSWER- false
A transform boundary is characterized by ________. - CORRECT ANSWER- a deep, vertical fault
along which two plates slide past one another in opposite directions
Wegener suggested the thick continents moved through the thinner ocean crust. (t/f) -
CORRECT ANSWER- true
Wegener thought that ________. - CORRECT ANSWER- there was once one big continent that
later broke into several pieces
The Himalayan Mountains are the tectonic product of a collision between India and Eurasia that
began 50 million years ago and still continues. (t/f) - CORRECT ANSWER- true
Most deformation occurs along plate boundaries because ________. - CORRECT ANSWER- the
plates are in constant motion and as a result the boundaries are where they interact
The Hawaiian Island-Emperor Seamount chain formed as a result of ________. - CORRECT
ANSWER- hot spot activities
The former late Paleozoic supercontinent is known as ________ - CORRECT ANSWER- pangea
, Which of the following is NOT evidence collected by the Glomar Challenger in support of the
Plate Tectonic model? - CORRECT ANSWER- Continental crust is typically several hundred million
years old and older
The San Andreas fault zone in California is an example of ________. - CORRECT ANSWER- a
transform plate boundary
The oldest rocks of the oceanic crust are found in deep ocean trenches far away from active,
mid-ocean ridges. (t/f) - CORRECT ANSWER- true
Lithosphere is destroyed at transform plate boundaries. (t/f) - CORRECT ANSWER- false
Most of the molten material that is generated above the subducting slab never reaches the
surface to form a volcano. (t/f) - CORRECT ANSWER- true
If you are in the path of a pyroclastic flow or a lahar, you have virtually no chance to run out of
its path on foot. (T/F) - CORRECT ANSWER- TRUE
Why does magma viscosity vary with silica content? - CORRECT ANSWER- Increasing silica
increases a tendency for silica bonds to link up in networks, acting like a polymerization of the
magma.
The Columbia Plateau in the northwestern United States is an excellent example of ________. -
CORRECT ANSWER- Flood basalts
Which of the following statements best describes the big Hawaiian volcanoes? - CORRECT
ANSWER- The Hawaiian volcanoes are situated in the interior of a large Pacific plate above a hot
spot deep in the mantle