HW 4 Flashcards
What is defined as a vent out of which lava or pyroclastic debris spews onto the planet’s surface or into the air.
volcano
Molten rock underground is referred to as what?
magma
Molten rock above ground is referred to as what?
lava
Fill in the blank:
Mafic igneous rocks contain _________ than felsic igneous rocks
less silica
Which rocks tend to be lighter in color, felsic igneous rocks or mafic igneous rocks?
felsic
Which igneous rocks are formed above ground from cooled lava?
extrusive
Which igneous rocks are formed below ground from cooled magma?
intrusive
Granite is an example of what?
intrusive igneous rock
Which of the following has the highest viscosity
marshmallow cream
What is the defining characteristic of a shield volcano?
Broad, gentle sloping structure formed by low viscosity lava
Volcanoes tend to occur along what plate boundaries?
convergent
Hawaii is an example of what tectonic feature?
hot spot
Which of the following is not a type of volcano?
crater
The violent types of eruptions are known as what?
explosive
The gentler eruptions with more viscous lava are known as what?
effusive
The most dangerous type of eruption that includes a violent eruption and ashflow/fall is called what?
pyroclastic
Which of these is not a classification of volcanic activity status?
intermittent
Volcanic unrest can be detected by monitoring the changes in seismicity, heat flow, groundwater level, and gases.
true
Which of the following are volcanic hazards?
Lava flows
Lahars
ALL OF THESE
Ash fall and ash clouds
There are active volcanoes in the contiguous United States as well as Alaska and Hawaii.
true
