Volcanology
1)
Read
Harden p. 70-75.
2)
What
is the difference between �active�, �potentially active�, and �inactive�
volcanoes?
3)
Approximately
how many active and potentially active vents are there in California, and in
what geomorphic regions do they occur?�
Be able to sketch a map of California and locate these areas.� Where is the �Eastern Sierra Nevada�?
4)
What
are silica tetrahedra?� What is the
relationship between silica content, polymerization, and viscosity?
5)
What
drives volcanic explosions?
6)
Contrast
the eruptive styles (i.e. explosivity, distance lavas flow from vents) or
mafic, intermediate, and silicic magmas.�
(see Harden Table 5-1, p. 71).
7)
Why
is Mt. Shasta high and the Modoc Plateau flat?
8)
Define
and use the following terms:
Obsidian
Vesicles
Pumice
Scoria
Pyroclatic
Tephra
Tuff
Fall Out
Pyroclastic flow (nuee ardente)
Shield volcano
Cinder cones
Stratocones or stratovolcanoes
Lava dome
9)
Sketch
and very briefly discuss the two stages that are typical in the development of
a lava dome (Plinian Eruption); part 3 deals with the formation of a coulee, a
short, stubby rhyolite lava flow, but you don�t need to know that term.
10)
Be
able to recognize the following volcanic features in slides:
a) Pyroclastic flows/nuees ardents
b) Shield volcanoes
c) Stratocones/stratovolcanoes
d) Cinder cones
e) Lava domes
f) From a picture of a lava flow, be able to make a
reasonable statement regarding the viscosity and composition of the lava.