Types of Volcanoes
a broad, gently sloping volcano built from fluid basaltic lava.
What are Shield Volcanoes?
This is a substance’s resistance to flow
What is Viscosity?
the mobility of lava is strongly affected by this
What is temperature.
When fluid basaltic lavas harden, they commonly form a relatively smooth skin that wrinkles as the still-molten subsurface lava continues to move which resemble twisted braids in ropes.
What are Pahoehoe Flows?
Magma originates when essentially solid rock, located in the crust and upper mantle, does this.
What is partially melts?
a small volcano built primarily of pyroclastic material ejected from a single vent.
What are Cinder Cones?
an opening to the surface
What is a vent?
this gets trapped in magma providing the force to eject molten rock from the vent.
What are Dissolved Gasses?
Another common type of basaltic lava which has a surface of rough, jagged blocks with dangerously sharp edges and spiny projections.
What are AA Flows?
This occurs when the confining pressure drops enough.
What is Decompression melting?
a volcano composed of both lava flows and pyroclastic material
What are Composite Cones
a mountain formed of lava and/or pyroclastic material
What is a volcano
the viscosity of magma is directly related to this.
What is its silica content.?
The most common gas released during a eruption.
What is water vapor?
This causes rocks to melt at lower temperatures
What is water?
these volcanoes are found by the thousands all around Earth
What are Cinder Cones?
a steep-walled depression located at the summit of many volcanoes.
What is a Crater?
This type of lava has high silica content and doesn’t flow easily.
What is rhyolitic lavas?
This is a block which have been ejected as glowing lava
What are bombs?
Heat is generated here when friction generates heat as huge slabs of crust slide past each other.
What are subduction zones?
These volcanoes are mostly located in a relatively narrow zone that rims the Pacific Ocean called the Ring of Fire
What are Composite Cones?
the name given to particles produced in volcanic eruptions.
What is Pyroclastic material
This type of lava contains less silica and tend to be more fluid.
What is basaltic lava?
the name given to particles produced in volcanic eruptions which include broken rock, fine ash, dust
What are Pyroclastic Materials?
Crustal rocks are heated as they descend into the mental during this.
What is subduction?