Volcanology
questions
Question #1 (2/22)
Q1. Contrast the differences between basaltic versus
rhyolitic magma in terms of:
Possible answers: Icelandic, Hawaiian,
Strombolian, Vulcanian, Plinian, Peleean types, or 'effusive lava',
'explosive pyroclastic', 'dome-building', etc. (Use as many answers
as you think fit.)
answer
#3
Question #4 (3/1)
Q4. For the following types of plate boundaries, what are the
predominant types of volcanoes and what significant hazards do they
pose to humankind?
List any other geologic settings for which there
may be significant volcanic hazards - give an example.
answer
#4
Question #5 (3/3)
Q5. In the United States there are numerous active or dormant
volcanoes. Select one active area/volcano that you believe poses a
significant hazard, and briefly describe the most serious impacts it
may have on society in the future.
(How should we, or the government, prepare for
this eventuality?)
Climate Change
questions
Question #6 (3/15)
Q6. What is the difference between 'weather' and
'climate'?
answer
#6
Question #7 (3/17)
Q7. What is the 'Greenhouse effect'? Explain in terms of atmospheric
composition.
A1. Basaltic magmas have higher temperature (>
~1150°C), and lower SiO2
(< ~52%) and viscosity (very fluid) than
rhyolites (typically <800-900°C, >68%
SiO2, and very 'pasty'
or inviscid).
These properties, and the added influence of
water, control the styles of eruption of these magma types.
A2. Any of the following changes, if sufficient
in degree, will cause the rock to begin melting:
A4. Volcanism associated with tectonic plate
margins:
A6. 'Weather' describes the short-term variations
in atmospheric conditions - on time scales ranging from hourly,
daily, or even seasonal.
'Climate' refers to these variations on longer time scales - decades, centuries, or millenia.
A7. The 'greenhouse effect' is a warming of the
Earth due to trapping of solar energy reflected from Earth's surface
by so-called 'greenhouse gases in the atmosphere. These gases include
water vapor, methane, and carbon dioxide, all of which occur in very
small amounts; because of their strong absorption properties they
have a significant effect on energy retention, thereby contributing
to global warming.