Exam 5: Mountain Belts and the Continental Crust

_____ are chains thousands of kilometers long composed of numerous mountain ranges.

One important result of orogeny is that continental crust becomes thicker.

The Himalayan Mountains formed as the result of ______ convergence.

A ______ is the source of sedimentary and volcanic material accumulating along a convergent boundary.

Frequent earthquakes are characteristic of mountain belts that are young and active.

A(n)__________ is an episode of intense deformation of the rocks of a region.

Continents grow bigger as _______.

The Grand Canyon,Ozark dome,Black Hills,and Adirondacks expose ________.

In some mountain belts the crust breaks into fault-bounded blocks resulting in _____ mountain ranges.

According to the concept of isostasy,lighter,less dense,continental crust "floats" higher on the mantle than denser oceanic crust.

In the Paleozoic Era the North American continent grew westward because of the accumulation of the Cordillera.

At the close of the Paleozoic,eastern North America was attached to what is now _______.

The _____ resulted from the collision of Asia and Europe.

Most of the world's mountains existing today are a result of ____.

Seismic studies indicate that continental crust beneath mountains and cratons is essentially the same thickness.

The Andes Mountains,where the South America Plate overrides the Nazca Plate,are a consequence of ocean-continent convergence.

The Appalachian Mountains are an example of ocean-ocean convergence.

_____ is the detachment of part of the mantle portion of the lithosphere beneath a mountain belt.

Geologists believe that when the thick and high part of a mountain belt becomes too high and gravitationally unstable _____ occurs.

Soapstone is a metamorphic rock composed of the mineral talc.