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Ch.20 (Exam 3)
Mountain Belts
| Question | Answer |
|---|---|
| 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
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