Geology 10 Chapter 20

Orogenies are not accompanied by metamorphism and igneous activity.

False

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 ________.

Wilson cycle

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

active mountain ranges

The Himalayan Mountains formed as the result of ______ convergence.

continent-continent

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

craton

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

delamination

Terranes that can be shown to have traveled great distances are known as _____ terranes.

exotic

Weathering and erosion play no role in the development of mountains.

false

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

gravitational collapse and spreading

According to the concept of ____, lighter less dense continental crust "floats" higher on the mantle than denser oceanic crust. delamination gravitational collapse geosynclines block faulting isostacy

isostacy

Geologists regard most bodies of ultramafic rock as being _______.

mantle material faulted into the crust during orogeny

A(n) __________ is an episode of intense deformation of the rocks of a region. isostatic adjustment geosyncline orogeny buoyancy event basin to dome event

orogeny

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

shale, limestone, and sandstones

Major mountain belts with higher mountain ranges tend to be geologically ___________ relative to those where the mountains are lower.

younger than