Volcanoes
There are how many different types of volcanoes?
There are four types of volcanoes
What kind of crust does Aa lava form
Forms brittle crust. Crust gets torn into little pieces as lava flows underneath.
What is a volcanic neck
Hardened magma in a volcano’s pipe. That may then remain after the rest of the volcano is weathered and eroded away
What are lava flows
Flow of molten rock which will continue to flow until cooled
What is Intraplate Volcanism
Igneous activity within a tectonic plate away from plate boundaries
How are shield volcanoes formed
Shield volcanoes are formed from fluid lava flows
Describe how Pahoehoe lava flows
Flows very slow like wax dripping from a candle
What is a sill
A tabular igneous body formed when magma is injected between sedimentary bedding surfaces.
When do volcanoes release ash clouds
Before, during, and after eruption
What is Viscosity
A measure of fluid’s resistance to flow
What is a Composite Volcano also called
It is also called a Stratovolcano
How does pillow lava flow?
Forms when eruptions occur underwater
What is a Laccolith
A massive igneous body intruded between preexisting strata.
What is a Lahar
When ash from volcanic eruptions mixes with melted snow or rain it can generate a mudslide.
What is a Crater
A depression found at the summit of a volcano, or a depression produced by a meteorite impact
How are Cinder Cone formed
Produced as ejected pyroclastic fragments cool in the air and pile up around the vent, relatively short-lived period of activity
Describe blocky lava
Cool and stiff. Doesnt travel far from the erupting vent of the volcano
What is a dike
A tabular-shaped intrusive igneous feature that occurs when magma is injected into fractures in the surrounding rock.
What do Pyroclastic flows consist of
Hot ash, gasses, and rock fragments
What is a Composite Cone
A volcano composed of both lava flows and pyroclastic material
Describe a Caldera
A very large, bowl-shaped depression
How is a lava plateau formed
It is produced by eruptions where repeated flows of basaltic lava build up in thick layers
What is a Batholith
A large mass of igneous rock that formed when magma intruded at depth, cooled and crystallized, then was subsequently exposed at the surface due to erosion.
What erupts out of calderas
Erupts both lava and pyroclastic flows, can reach more than a hundred miles away
What is a Mantle Plume
A mass of hotter-than-normal mantle material that ascends toward the surface, where it may lead to igneous activity