geology test 4

60 cards

Flashcards made for test four.  Chapters 12, 16, 17, and 18 


 
  
Created Dec 11, 2011
by
gooditl1

 

 
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1
Most Dry lands (low latitude deserts) are located in the vicinity of ____degrees north and...
 
30
2
Seamounts
 
are volcanoes that form on the ocean floor. 
3
The East coast of North America considered a _____ Continental Margin?
 
Passive
4
The San Andreas Fault in California is the boundary between the North American and Pacific...
 
Strike-Slip fault
5
Submarine canyons found on the continental slope and rise are believed to have been created____.
 
by turbidity currents. 
6
Which of the following is not true about deep ocean trenches: They are long and narrow...
 
They are geologically very stable
7
_____continental margins typically exhibit wide, extensive, continental shelves. 
 
Passive
8
The _____lies at the base of the continental slope. 
 
Continental rise
9
Geologically, what is the best way to explain accumulations coral limestone beneath most atolls? 
 
The volcano never reached, but came close to the sea level surface, allowing for the coral...
10
The term ____refers specifically to geologic mountain building.
 
Orogenesis
11
An erosion removed the tops of mountain ranges, the crust will buoy (float) upward (like an...
 
Isostacy
12
Determine the type of geological structure.
 
Normal fault 
13
Determine the type of geological structure.
 
Reverse fault 
14
An unconformity is a buried _____.
 
Surface of erosion separating younger strata above from older strata below. 
15
A linear down folded structure with the youngest strata in the center is termed____.
 
Synclines
16
Large circular down warped structures, like those found in Michigan and Illinois, are referred...
 
Basins
17
A "Andean" type plate boundary is a classic demonstration of how the mountain building process...
 
At a subduction zone
18
Guyots are_____
 
Underwater flat-topped seamounts
19
Which of the following best characterizes an angular unconformity
 
Tilted strata lie below the unconformity, and bedding in younger strata above is parallel to...
20
In mountain regions, the Earth's crust is_____
 
thicker than average
21
Which of the following geologic observations would not bear directly on working out the sequence...
 
The mineral content of granite
22
What fundamental concept states that in a horizontal sequence of conformable sedimentary strata,...
 
Law of superposition
23
What of the following refers to the investigative process by which geologists identify and...
 
Correlation
24
Does unconformity come before intrusion?
 
Yes
25
Which one of the following represents the greatest expanse of time in the Geologic Time Scale
 
Precambrian
26
The half-life of a radioactive element is 6000 years.  A sample of rock is 12,000 years...
 
one-fourth
27
Define nonconformity
 
an unconformity that separates crystalline rocks,either igneous or metamorphic, from sedimentary rocks.
28
The mountains on the Western North American Continent (Alaska in particular) were produced...
 
Terranes
29
What is the age of the Earth accepted by most scientists today?
 
4.5 billion years
30
What is an essential characteristic of an index fossil?
 
The organism only lived for a short period of geologic time.  
31
What combination favors folding rather than faulting?
 
High temperature and high confining pressure
32
____is the process (question 28) that occurs at active continental margins where sediments...
 
Accretion.
33
Four factors  that influence the strength of rock and how it will deform
 
temperature, confining pressure, rock type, and time.
34
What is the one best measure of the wetness or dryness of a desert region?
 
Difference between annual precipitation and evaporation potential.
35
Look at the map view.
 
-l
36
Desert pavement is the result of ______
 
Deflation from wind.
37
_____are not associated with a mid ocean ridge
 
deep ocean trenches.
38
How does wind transport sand grains?
 
by saltation as part of the suspended load.
39
T/F the predominant particle size in loess deposits is gravel and boulders.
 
F
40
T/F a playa is a dry, flat lake bed on the floor of a desert basin.
 
T
41
Desert definition____
 
Despite infrequent rainfalls, erosional and depositional features of running water are important...
42
A worm would stand a poor chance of being fossilized because_____
 
worms have no hard parts
43
The ____ is the idea or concept that ancient life forms succeeded each other in definite, evolutionary,...
 
Principle of fossil succession
44
An echo sounder operates by measuring the time required for a______
 
sound pulse travels from a ship to the seafloor and back.
45
Look at map view.
 
Anticline
46
Long sand dunes that are oriented more or less parallel  to the prevailing wind with limited...
 
Longitudinal
47
Solitary dunes who tips point downwind are_____dunes.
 
Barchan
48
T/F abyssal plains owe their relatively featureless topography to thick accumulations of sediments...
 
T
49
There is a considerable span of time for which there is no deposition and/or erosion between...
 
Disconformity
50
Sandstone strata and a mass of granite are observed to be in contact.  What statement...
 
The granite is older if the sandstone contains inclusions of the granite.
51
Deposits that form as a result of dense-sediment-laden water running down submarine canyons...
 
Turbidites
52
____bedding occurs in the sedimentary deposits formed in question 51.  This type of bedding...
 
Graded
53
Streams in desert regions that flow intermittently are referred to as______.
 
Ephemeral
54
Deserts have discontinuous drainage pattern of intermittent streams that do not eventually...
 
Interior
55
T/F trenches form the deepest parts of the ocean basins.
 
T
56
T/F Steppes are the driest of the true desert lands
 
F
57
Interestingly shaped stones produced by wind abrasion are called_____
 
Ventifacts
58
Dip faults have mainly ____ movement
 
vertical
59
Left lateral____
 
road moves left 
60
T/F fractures in rock  that have not involved any fault slippage are called joints
 
T

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