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Ch.20 (Exam 3)

Mountain Belts

Geologists believe that when the thick and high part of a mountain belt becomes too high and gravitationally unstable _____ occurs. gravitational collapse and spreading
The Himalayan Mountains formed as the result of ______ convergence continent-continent
Terranes that can be shown to have traveled great distances are known as _____ terranes. exotic
A(n) _________ mountain range, such as the Basin and Range and Tetons, implies a horizontal extension strain. fault block
The system approach regards mountains as the products of three closely interdependent components. Which of the following is not one of those components? meteor impacts
According to the concept of ____, lighter less dense continental crust "floats" higher on the mantle than denser oceanic crust. isostacy
In some mountain belts the crust breaks into fault-bounded blocks resulting in _____ mountain ranges fault-block
Of the two major mountain belts in North America, the _______ are in the West. North American Cordillera
During the last couple of decades, geologist have used a _____ approach to gain insight into the growth and wearing away of mountains. system
A _____ terrane has rock types and ages that do not seem to be related to the rest of the geology of a mountain belt. suspect
Major mountain belts with higher mountain ranges tend to be geologically ___________ relative to those where the mountains are lower. younger than
_____ faults in the Tibetan plateau indicate that gravitational collapse is taking place. Normal
Late stage normal faulting in a mountain range is a result of _______. vertical uplift or extension
A ______ is the source of sedimentary and volcanic material accumulating along a convergent boundary magmatic arc
A _____ is a group of closely spaced mountains or parallel ridges that may show a history of intrusive tectonic activity mountain range
The continental crust is _______ beneath mountain belts than under the craton. thicker
Most of the _____ of the United States has/have a very thin blanket - only 1000 to 2000 meters - of sedimentary rock layers. craton
_____ are chains thousands of kilometers long composed of numerous mountain ranges. Mountain belts
Continents grow bigger as _______. mountain belts evolve along their margins
The _____ is(are) the product of oceanic-continental convergence and Earth's second highest mountain belt. Andes
The _____ resulted from the collision of Asia and Europe. Ural Mountains
Extension and normal faulting take place in a mountain range ____. when rock at high level flows outward
Most of the world's mountains existing today are a result of ____. intense deformation, isostasy, and weathering and erosion
____, intermixed granitic and metamorphic rock, may represent those parts of mountain belts that were once at even deeper levels of the crust. Migmatites
At the close of the Paleozoic, eastern North America was attached to what is now _______. Europe and Africa
Frequent earthquakes, offshore trenches, and active volcanoes perched on top of older rock are all indications of ____. active mountain ranges
The region of a continent that has been structurally stable for a long period of time is called the ______. craton
Volcanic rocks, mostly _______, accumulate near a convergent plate boundary andesites
The once deep-seated roots of former Precambrian mountain belts are the _____ rock for the now stable, central part of the continent. basement
In many mountainous regions are found ____, which are characterized by large thrust faults stacked one upon another. fold and thrust belts
Geologists regard most bodies of ultramafic rock as being _______. mantle material faulted into the crust during orogeny
Migmatites must have been transported much higher in the crust during and after ____. an orogeny
A(n) __________ is an episode of intense deformation of the rocks of a region. orogeny
Created by: Thomas.Siu