general volcano
Volcanoes are made of __________ rocks.
igneous
The depression found at the top of most volcanic cones is called a __________.
Crater
The viscosity of lava depends mainly on its __________.
Silica content
Pillow lava forms
under water
Which of the volcanic structures is the most common?
stratovolcano
Geologists believe that the earth's interior temperature is highest in the __________.
Inner core
what type of emission is lava
liquid emission
A depositional mountain built up by molten rock that has risen to the earth's surface through a vent is called a(n) __________.
volcano
The term volcano originally came from the name for
A Roman god
A volcanic crater is most clearly indicated on a topographic contour map by
hatched contour lines
A rapid downhill movement of hot, solid, volcanic particles suspended in steam is a __________.
pyroclastic flow
Mineral terraces are often associated with __________.
hot springs
Which of the following volcano types takes up the most land area?
shield volcano
How is a volcano's activity classified?
Active, dormant, extinct
what type of emission is tephra?
solid emission
Heated water and steam ejected from the ground.
Geyser
A volcano begins to form when magma forces its way to the surface and breaks through, forming a hole or __________.
vent
The largest types of plutons are __________.
batholiths
A mudslide caused by a volcano is called a __________.
lahar
Where are most of the volcanoes in the Pacific Oceanic Plate located?
At the plate's edges
How are volcanoes classified?(3 answers)
Activity, structure (emissions, size, and shape), and explosivity
Define and give an example of extrusive volcanism.
Extrusive volcanism involves landforms that form on top of the earth’s crust, such as volcanoes.
what type of emission is pahoehoe?
solid emission
A vent in the ground through which hot gases escape is called a(n) __________.
fumarole
The eruption of _________ was the largest volcanic event in recorded history.
Mount Tambora
Batholiths and laccoliths are both types of __________.
Plutons
tiny, angular, glassy fragments
ash
Most active volcanoes in the world exist...
near convergent tectonic plate boundaries.
a volcano that emits mostly lava in quiet eruptions
shield volcano
Define and give an example of intrusive volcanism.
Intrusive volcanism involves igneous landforms that form inside cracks in the earth’s crust. Erosion can reveal these intrusive landforms over time. Examples include sills, dikes, and plutons. Hydrothermal features such as hot springs, geysers, and mudpots are also signs of intrusive volcanism below the earth's surface.
what type of emission is a fumarole emission?
gaseous emission
Thick layers of igneous rock covering large portions of the earth thought to have formed when huge quantities of magma were released through cracks in the earth's crust are called __________.
flood basalts
How can earth science help reduce the risks of natural hazards from volcanoes?
As geologists study volcanoes, they can better understand their structure, activity, and hazards. That helps us to protect people’s lives and possessions.
What is another name for the Circum-Pacific volcano belt?
The ring of fire
Harnessing heat produced by magma to generate energy is called __________
geothermal energy
Arrange the following intrusive volcanic formations in order of increasing size: batholiths, laccoliths, stocks.
Stocks, laccoliths, batholiths
Why is the term stratovolcano appropriate for the volcano structure that it describes?
A stratovolcano intermittently releases both lava and pyroclastic materials. The lava and tephra form layers, or strata.
What do intrusive and extrusive volcanism have in common?
Both intrusive and extrusive volcanism occur at plate boundaries due to magma inside the earth.
what type of emission is a'a'?
liquid emission
A scale that geologists use to classify the destructiveness of a volcanic eruption is called the __________.