Homework 6
Geology 3265
Name __________________
Use these questions to test your knowledge of Volcanoes
A. Match the terms.
1) Flood Basalt
a. extensive flat lava layer without cone, inviscid
2) Shield Volc.___
b. huge cone with gentle slopes; low viscosity
3) Composite Volc.___ c. lava and ash layers, intermediate viscosity
4) Nuée ardente ____ d. pyroclastic flow
5) Lahar
_____
e. mudflow mixture of ash and water
6) Lava Dome __
f. mound from slow extrusion viscous lava
7) Caldera__
g. cone falls into emptied magma chamber
8) Maar __
h. low-relief crater due magma-water contact
9) Phreatomagmatic __ i. explosive eruption when magma contacts water
10) Ignimbrite__
j. welded tuff
11) Tephra__
k. solid fragments produced by a volcanic eruption
12) Sill__
l. intrusion between overlying layers
13) Dike__
m. near vertical intrusion through overlying layers
14) Laccolith__
n. mushroom shaped intrusion between layers
15) Pluton
o. intrusion in earth’s interion
16) Batholith __
p. large collection plutons freezing of deep magma
B. Calcs.
17) Prior to a field season, a geologist assembles information on the area.
First we need to know where the field area is.
While working on Wyoming BLM properties in the 1980’s, I prospected
potential mining claims on the weekends. One such area is Fremont County,
Wyoming, which contains the Antelope Ridge mines.
http://www.lat-long.com/Latitude-Longitude-1584888-Wyoming-Antelope_Ridge.html
The latitude and longitude of a point on the ridge is
Latitude: 43-34'10'' N
Longitude: -108-57'17'' W
Convert these coordinates to decimal format.
Example: Suppose instead you want Kean University
Latitude: 40-40'46'' N Longitude: 074-14'07'' W
Latitude 46”/60 = 0.766666666 minutes so 40o and 40.7666666’
40.7666666’/60 = .679 so 40.679o
Same drill for Longitude 74o 14’ 7” so 7/60 = .116’ so 74o 14.116’ and
14.116’\60 = 0.235o so 74.235o