ERTH 111- Exam 2 With
Complete Solution
A volcano is a constructional edifice formed from __________ and ____________. -
ANSWER Lava, tephra
The melting temperature of magmas is primarily controlled by
_________________________. - ANSWER Composition
The viscosity of magmas is primarily controlled by _________________________. -
ANSWER All of the above: Degree of polymerization, Temperature, Volatile
content
The ease of degassing in magmas dictates the ____________. - ANSWER
Explosive potential
The type of volcano produced is primarily a factor of the _______________. -
ANSWER Type of volcanic activity
Erupting magmas with a high amount of silica but low gas contents will
produce ____________. - ANSWER Steep-sided domes
Erupting basaltic magmas with low gas contents will produce _____________,
while basaltic magmas with high gas contents will produce ________________. -
ANSWER Lava flows, fire fountaining
Phreatic eruptions occur as an external source of _____________ interacts with
magma. - ANSWER Water
The eruption of many thin, runny lava flows will produce a ________________
, volcano . - ANSWER Shield
A volcano type composed of a mixture of lava and tephra is a ________________
volcano. - ANSWER Strato or composite
A volcano type composed of all tephra is a ________________ volcano. - ANSWER
Cinder cone
The eruption of thick, sticky lava flows with low gas will produce a
______________ volcano . - ANSWER Dome
If magma is withdrawn from a subsurface chamber it can produce
a___________________. - ANSWER Caldera
A volcano that erupts only once is ________________ while a volcano that erupts
multiple times is _______________. - ANSWER Monogenetic, polygenetic
A shield volcano is ________________ while a cinder cone is __________________. -
ANSWER Polygenetic, monogenetic
Mt Rainier in Washington is not as conical as Mt Mayon in the Philippines
due to later modification by _________________. - ANSWER Glaciers
An excavational, monogenetic volcano is a ___________________ . - ANSWER
Maar
An excavational, polygenetic volcano is a ___________________ . - ANSWER
Caldera
An constructional, steep-sided polygenetic volcano is a ___________________ . -
ANSWER Composite cone
An constructional, gentle-sided polygenetic volcano is a ___________________ . -
ANSWER Shield volcano
Complete Solution
A volcano is a constructional edifice formed from __________ and ____________. -
ANSWER Lava, tephra
The melting temperature of magmas is primarily controlled by
_________________________. - ANSWER Composition
The viscosity of magmas is primarily controlled by _________________________. -
ANSWER All of the above: Degree of polymerization, Temperature, Volatile
content
The ease of degassing in magmas dictates the ____________. - ANSWER
Explosive potential
The type of volcano produced is primarily a factor of the _______________. -
ANSWER Type of volcanic activity
Erupting magmas with a high amount of silica but low gas contents will
produce ____________. - ANSWER Steep-sided domes
Erupting basaltic magmas with low gas contents will produce _____________,
while basaltic magmas with high gas contents will produce ________________. -
ANSWER Lava flows, fire fountaining
Phreatic eruptions occur as an external source of _____________ interacts with
magma. - ANSWER Water
The eruption of many thin, runny lava flows will produce a ________________
, volcano . - ANSWER Shield
A volcano type composed of a mixture of lava and tephra is a ________________
volcano. - ANSWER Strato or composite
A volcano type composed of all tephra is a ________________ volcano. - ANSWER
Cinder cone
The eruption of thick, sticky lava flows with low gas will produce a
______________ volcano . - ANSWER Dome
If magma is withdrawn from a subsurface chamber it can produce
a___________________. - ANSWER Caldera
A volcano that erupts only once is ________________ while a volcano that erupts
multiple times is _______________. - ANSWER Monogenetic, polygenetic
A shield volcano is ________________ while a cinder cone is __________________. -
ANSWER Polygenetic, monogenetic
Mt Rainier in Washington is not as conical as Mt Mayon in the Philippines
due to later modification by _________________. - ANSWER Glaciers
An excavational, monogenetic volcano is a ___________________ . - ANSWER
Maar
An excavational, polygenetic volcano is a ___________________ . - ANSWER
Caldera
An constructional, steep-sided polygenetic volcano is a ___________________ . -
ANSWER Composite cone
An constructional, gentle-sided polygenetic volcano is a ___________________ . -
ANSWER Shield volcano
