Week 2/3 quiz - Plate tectonics, divergent margins and convergent margins Flashcards
At which of the following does an island volcanic arc occur in the present day?
the Aleutian Islands of Alaska
All other factors being equal, intrusive rocks that form deep within Earth ________ than intrusive rocks that cool near the surface.
cool more slowly
Which of these properly illustrates the principle of isostasy?
Mountains stand high because they are gravitationally balanced by their deep crustal roots.
Which of these is NOT the result of plate tectonics?
convection in the outer core
You are studying the seismic data from Mars when you notice that there are no S-waves recorded from 130° through 180° on the opposite side of the planet. What does this information tell you about the interior of Mars?
There is a layer of liquid material in the interior of Mars.
If a seismic wave is refracted upward at a boundary, what can be said about the material the wave is traveling through?
The wave is moving from a slower material into a faster material.
In the scope of plate tectonics, an active margin is defined as ________.
a continental coastline that coincides with a plate boundary
Segments of mid-ocean ridge systems are offset. Between the offset segments we observe ________.
transform faults
The lithosphere of the Earth is generally thinnest at ________ plate boundaries.
divergent
Most of the pulling force driving plate motion is produced ________.
at subduction zones
At a subduction zone, the overriding plate ________.
may be composed of either oceanic or continental lithosphere
Most of the pushing force driving plate motion is produced ________.
at mid-ocean ridges
At which of the following does a continental volcanic arc occur in the present day?
The andes Mountains
Mid-ocean ridges are segmented and contain which two basic types of plate boundaries linked together?
divergent and transform
Which layer of the Earth has the highest density?
Inner Core
