Exam 5: Mountain Belts and the Continental Crust

The sedimentary sequences that form on passive margins are predominantly ____.

A cycle of splitting of a supercontinent,opening of an ocean basin,followed by closing of the basin and collision of continents is known as a Wilson Cycle.

Volcanic rocks,mostly _______,accumulate near a convergent plate boundary.

The region of a continent that has been structurally stable for a long period of time is called the ______.

The _____ is(are)the product of oceanic-continental convergence and Earth's second highest mountain belt.

Most of the _____ of the United States has/have a very thin blanket - only 1000 to 2000 meters - of sedimentary rock layers.

A Precambrian shield,an area of no sedimentary rocks,covers much of eastern and northern Canada.

The cycle of splitting of a supercontinent,opening of an ocean basin,followed by closing of the basin and collision of the continents,is known as a ________.

A(n)_________ mountain range,such as the Basin and Range and Tetons,implies a horizontal extension strain.

Orogenies are not accompanied by metamorphism and igneous activity.

Some accreted terranes were microcontinents similar to present day New Zealand.

Migmatites must have been transported much higher in the crust during and after ____.

The more open the folds,the less intense the deformation in a mountainous region.

In many mountainous regions are found ____,which are characterized by large thrust faults stacked one upon another.

A _____ is a group of closely spaced mountains or parallel ridges that may show a history of intrusive tectonic activity.

Mountain belts are characterized by sedimentary sequences that show little or no deformation.

____,intermixed granitic and metamorphic rock,may represent those parts of mountain belts that were once at even deeper levels of the crust.

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

Frequent earthquakes,offshore trenches,and active volcanoes perched on top of older rock are all indications of ____.

On the North American continent,the Appalachian Mountains extend from western Canada through the western United States into New Mexico.