Old Earth Ministries Online Geology Curriculum

Geology Chapter 5 Test

Please ensure that any other browser windows are closed. Please choose the correct answer for each question below. There are 20 questions. You cannot save your progress and come back later to complete the test, therefore you must complete the test during one session. Please enter your name, a single character in the email field, and any number in the Student ID field.

Please enter your Full Name:
Your Email Address:
Your ID Number or Password:

1: Magma which is mostly basaltic composition is also called: granitic magma
felsic magma
mafic magma
2: Texture consisting of extremely small crystals, which indicates that the rock cooled quickly enough to prevent the formation of large crystals, is called: glassy texture
porphyritic texture
phaneritic texture
aphanitic texture
3: A rock that displays conchoidal fracturing with sharp edges is what texture?: aphanitic texture
pyroclastic texture
glassy texture
vesicular texture
4: A rock that has all of its crystal grains large enough to be seen with the naked eye is called: phaneritic texture
porphyritic texture
pyroclastic texture
aphanitic texture
5: The matrix of an igneous rock is: the crystals that are visible to the naked eye
the aphanitic portion of a rock that has fine-grained crystals
the holes (vesicles) of a gaseous rock
fragments that were melted together during a volcanic eruption
6: Larger crystals which are visible, and surrounded by a fine-grained matrix, are called: pyroclasts
phenocrysts
intrusive crystals
7: The rock "tuff" exhibits what type of texture?: pyroclastic texture
vesicular texture
glassy texture
aphanitic texture
8: Igneous rocks are classified based on what two features?: Texture and number of different minerals present
Composition and texture
Composition and color
Texture and vesicles
9: There are two basic types of igneous rock bodies. Rocks which are glassy and vesicular are...: intrusive rocks
extrusive rocks
10: Gabbro is a course-grained rock formed from a mafic magma.: True
False
11: Rock texture that has a fine-grained matrix, with some larger crystals, is called: phaneritic texture
aphanitic texture
porphyritic texture
vesicular texture
12: Granite is an intrusive, felsic igneous rock.: True
False
13: The most common aphanitic rock is...
14: Pumice and tuff are both vesicular rocks.: True
False
15: Batholiths are large, intrusive rock bodies, typically composed of...: basalt
gabbro
rhyolite
granite
16: A narrow, tabular body of igneous rock that fills in fractures in the surrounding rock is called...: a batholith
a sill
a dike
a stock
17: A laccolith is a lens-shaped body that has pushed up the overlying rock layers.: True
False
18: If substance A is less viscous than substance B, which one will be more fluid and able to flow easier.: Substance A
Substance B
19: Inclusions are blocks and pieces of surrounding rocks that have become imbedded in the igneous rock body. Inclusions are common in...: dikes
sills
stocks
20: This rock is a course-grained rock, intermediate in composition between felsic and mafic magmas.: gabbro
diorite
rhyolite
andesite