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Earthquakes & Volcanoes Flashcards | StudBud
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Earthquakes & Volcanoes
Earthquakes & Volcanoes
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30 cards
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Questions
30
Answers
1
Few earthquakes occur in the middle of continents because
few plate margins exist in these areas
P-waves cannot travel through liquids
S-waves cannot travel through the crust
the crust in these areas isn't think enough
2
The damage done by an earthquake is measured
by one or more seismometers
directly at the earthquakes focus
on the Richter scale
on the Modified Mercalli Scale
3
The eruption of a Hawaiian volcano would most likely cause
a bastaltic lava flow
large volumes of ash
a large-scale climate change
a pyroclastic flow
4
Each increase of 1 unit on the Richter scale represents ____ times the amount of ground motion
100
1000
10
1.0
5
Which statement is true of Earthquakes?
Most occur in the middle of oceans & along convergent bound.
Most deep quakes occur along divergent plate boundaries
Most shallow earthquakes occur along suduction zones
Most occur along transform fault boundaries
6
Which occurance would be unlikely if Mount St. Helens expereinces another major eruption?
a release of gases
earthquake swarms
widespread basaltic lava flows
pyroclastic flow
7
Magma that is rich in gases will form a volcano
whose lava has a low viscosity
that erupts explosively
with gently sloping sides
8
Where do most volcanoes erupt?
along divergent plates
in the middle of tectonic plates
along sliding plate boundaries
9
Which seismic waves generally cause the most earthquake damage?
surface
primary
secondary
10
Most earthquakes occur
along plate boundaries
in the midde of plates
in the central part of a continent
11
Which is not a volcanic hazard?
subduction of tectonic plates at a boundary
sulfur dioxide gases from an eruption
pyroclastic flows in populated areas
12
Why do most volcanoes occur along convergent and divergent margins?
mantle material cannot melt far from these plate margins
isolated mantle plumes are produced along margins
only magma that forms at these boundaries contains silica
The movement of these margins produces magma
13
The waves first felt in an earthquake
P- waves
T-Waves
R-Waves
S-waves
14
Most of Earth's Volcanoes occur
along convergent and divergent plate boundaries
over mantle plumes
in the middle of tectonic plates that converge
along transform-fault plate boundaries
15
small, steep-sided volcano made of basalt
cinder cone
composite
shield
16
Hot spot volcanoes form as a result of a plate moving over a plume in the mantle
False
True
17
Two blocks of rock pull apart and one drops down relative to the other
Normal fault
Strike-slip fault
reversed fault
18
This is an example of....
Earthquake
Volcanic Eruption
19
Cinder cones are small, steep-sided volcanoes made of basaltic lava.
False
True
20
The presence of ____ in lava increases its explosiveness
fumes
bad eggs
gases
air
21
A shield volcano has gentle slopes of basaltic lava
true
false
22
large, steep-sided volcano made of lava and ash
cinder cone
composite
shield
23
The location directly above the focus is its
fault
epicenter
plate
24
The total energy released by an earthquake is best measured on the
Modified Mercalli Scale
Moment magnitude scale
Richter Scale
25
In a triangulatio, scienctists locate earthquakes using data from ____ seismometers.
at least 3
two
one
zero, we don't need them
26
Volcanoes form when magma
hardens beneath the surface
flows through the crust
changes in composition
27
What have scientists learned more about by studying earthquakes?
the location and compositions of major volcanoes
the age and structures of Hawaiian hot spots
the composition and structure of Earth's Interior
28
Volcano with gentle slops made from basalt
shield
composite
cinder cone
29
Moment magnitude scale measures the total energy an earthquake releases
True
False
30
Volcanoes that erupt ____ lava are explosive because the lava is high in silica content
nitrogen
carbon dioxide
rhyolitic
andesitic
