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a volcanic neck
Hardened magma in a volcano's pipe that remains when softer rock around it has worn away is called the volcanic neck.
When magma has solidified in a volcanoes vent it is known as a volcanic plug. In some cases when there is a plug present in a stratovolcano, it can lead to very large explosive eruptions as pressure builds within the volcano.
A volcano is not limited to 10 parts. It's basic structural portions include: A large magma chamber that can, dependant on it's size, be considered a batholith (ranging many kilometers in area) or a laccolith (smaller). Bedrock, which may be cut with magma to form either dikes (discordant to the bedrock) or sills (concordant to the bedrock) A conduit, which is basically the pipe that feeds the volcano with magma. A throat, which is basically the near-end of the pipe where it begins to widen to allow for the discharge of liquid hot magma (soon-to-be lava, pyroclastic material-- that is, layers of ash/debris that is emitted by the volcanic eruption) A flank, which refers to a particular side of the volcanic structure A base, which refers to the meeting-point of the volcanci structure to the earth's crust/ground. A vent, whcih is an opening that allows for the passage of air.
When magma has solidified in a volcanoes vent it is known as a volcanic plug. In some cases when there is a plug present in a stratovolcano, it can lead to very large explosive eruptions as pressure builds within the volcano.
a volcanic neck forms when magma hardens in a volcano's pipe and is later exposed.
A volcanic plug. Frequently when glacially eroded these plugs form crag and tail feature.
Devils Tower in Wyoming is an exposed pipe of an old volcano. It is over 700 feet high and composed of solid rock.
Volcanic Neck The surrounding rock weathers more easily than the magma in the pipe. The resultant structure will first appear as a low flat protrusion which is slightly elevated from its surroundings. With additional weathering of the surrounding rock, the hardened magma may appear as a tower with possible basaltic columnar structure known as a volcanic plug or volcanic neck.
Volcanic Neck The surrounding rock weathers more easily than the magma in the pipe. The resultant structure will first appear as a low flat protrusion which is slightly elevated from its surroundings. With additional weathering of the surrounding rock, the hardened magma may appear as a tower with possible basaltic columnar structure known as a volcanic plug or volcanic neck.
What kind of pipe? Is this area exposed to acid rain?
The Overt is the top of a pipe at a point on its outer wall. ie the soffit + pipe thickness - Often used when surveying an exposed pipe when unable to use the invert or soffits.
volcanic neck
It's easier to find an exposed section of pipe and cut it out, remove sediment and replace pipe.
a volcanic neck
cigar cigarette pipe cigarette
a volcanic neck