EXAM TWO I

Question 1

Intraplate volcanism is usually associated with

Answer 1

mantle plume

Question 2

Extrusive igneous rocks can be quiet or explosive, depending on _____ of the magma

Answer 2

viscosity

Question 3

______ are massive, intrusive bodies greater than 100 km which frequently form cores of mountains

Answer 3

batholiths

Question 4

A ______ is a structure that results from emplacement and crystallization of magma beneath Earth’s surface:

Answer 4

Pluton

Question 5

The Sierra Nevada Range is an example of a _______.

Answer 5

Batholith

Question 6

A dike is a ________.

Answer 6

massive tabular or irregular body of igneous rock which cuts across layers of bedding in country rock

Question 7

A tabular body of igneous rock which squeezed in between layering of sedimentary rocks is a ______

Answer 7

Sill

Question 8

A _____ is a steep-walled depression (1-1.6 km diameter) at summit of volcano:

Answer 8

Crater

Question 9

A _______ is a summit depression greater than 1. 6 km diameter produced by collapse of summit following a massive eruption:

Answer 9

Caldera

Question 10

Highly explosive magmas are controlled by wish of the following?

Answer 10

high silica content, high water content and low temperatures