Volcanoes
The viscosity of lava depends mainly on its __________.
Silica content
A(n) __________ is a depositional mountain built up by molten rock that has risen to the earth's surface through a vent.
Volcano
Pressure underground is released and the water there boils & turns to steam creating a(n)
Geyser
Looking at a volcano from a distance, its most recognizable feature is its __________.
Cone
Name at least one famous volcano that we have studied in class other than the yellowstone caldera (please spell correctly)
Answers will vary
The depression found at the top of most volcanic cones is called a __________.
crater
The internal energy of the earth, particularly evident in areas where hot springs and geysers exist, is sometimes harnessed for man's use. This is called __________ energy.
geothermal
Batholiths and laccoliths are both types of __________.
plutons
A rapid downhill movement of hot, solid, volcanic particles suspended in steam is a __________.
pyroclastic flow
a large, steep volcano built up of alternating layers of lava and ash or cinders is a ________ volcano
composite
This type of volcano is usually not as steep as other volcanos
shield
what type of rocks are volcanoes made up of?
igneous
This results when water that is trapped underground becomes superheated until finally the pressure builds enough for it to break the seal of the Earth’s crust.
Geyser
widespread, thick layers of lava covering millions of square miles are called
flood basalts
Where do geysers and hotsprings occur?
Where volcanic lava lies just below the surface
volcano that emits mostly cinders, ashes, and bombs is a(n)
Cinder-cone
Most active volcanoes in the world exist __________.
near convergent tectonic plate boudnaries
A volcano begins to form when magma forces its way to the surface and breaks through, forming a hole or __________.
Vent
an enlarged depression caused by an explosion or the collapse of a volcanic cone is a(n)
caldera
streamlined mass of ejected lava that solidified in flight is called a(n)
bomb
The largest volcanic eruptions in the history of the earth were probably similar to __________.
the eruption that formed the Yellowstone Caldera
Give at least one thing The VEI of a volcano's eruption is based on
the amount of tephra produced
the height of the eruption cloud
a descriptive estimate of the explosion
What are flood basalts?
widespread, thick layers of lava covering millions of square miles
Which of these lists is in correct order from smallest to largest?
Ash--> cinder--> bomb
What is a fumarole?
A(n) __________ is a vent in the ground through which hot gases escape.