how ar intrusive igneous bodies classified A.) by their size B.) by their …

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How are intrusive igneous bodies classified?

Question:

How are intrusive igneous bodies classified?

Answer and Explanation:

Intrusive igneous bodies are classified according to their size, shape, and relationship to the rock they have intruded.

On the basis of size, the types of intrusive igneous bodies are:

  • Batholiths (greater than 100 km2)
  • Stocks (less than 100 km2)

On the basis of shape, the types of intrusive igneous bodies are:

  • Laccoliths (lens-shaped)
  • Dikes (wall-like)
  • Sills (horizontal sheet)

On the basis of relationship to the rock they have intruded, the types of intrusive igneous bodies are:

  • Laccoliths (sandwiched between two sedimentary rocks)
  • Stocks (present in association with batholiths)
  • Dikes (vertically intrude igneous rocks)
  • Sills (intrude between rock layers)

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Intrusive Igneous Rock: Definition & Examples

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45 terms

TheLovelyBonesXx

Volcanoes and Igneous Rocks

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Why can two igneous rocks have the same minerals, but different names?
They may have different textures
The Igneous rock texture that is characterized by two distinctly different crystal sizes is called–
Porphyritic texture
Most shield volcanoes have grown from the ocean floor to form what?
Islands
The volcanic landform that is formed when the more resistnat volcanic neck pipe remains after most of the cone has been eroded is called–
volcanic neck
What is naturally occurring, solid masses of mineral or mineral-like matter?
rock
What are igneous bodies larger than sills, anad associated with major mountain ranges?
batholith
How was Crater Lake formed?
The summit of a volcano collapsed
Name three things that affect how violently a volcano erupts,
magma composition
magma temperature
concentration of dissolved gases
Name a characteristic of a cinder cone volcano
steep sided
What commonly horizontal intrusive igneous body is formed when magma is injected parallel to sedimentary bedding planes?
Sill
What is a caldera?
a large depression in a volcano
What is the most abundant gas associated with volcanic activity?
water vapor
Most of the active volcanoes on earth are located in a belt known as what?
The Ring of Fire
A lens-shaped intrusive mass close to earth’s surface is called a–
laccolith
Magma tends to rise towards earth’s surface primarily because–
rocks become less dense and more buoyant when they meet
The particles produced in volcanic eruptions are called what?
Pyroclastic material
The broad, slightly dome-shaped volcanoes of Hawaii are?
Shield Volcanoes
The most violent volcanic eruptions are associated with what type of volcano?
Composite cones
The volcanic landforms at divergent ocean plate boundaries are?
Oceanic Ridges
Name three things that are considered to be pyroclastic flow.
Ash
Lapilli
Cinders
Large particles of hardened lava ejected from a volcano are called?
Blocks
As the temperature of lava increases, the viscosity–
decreases
A rock that forms when magma hardens beneath earth’s surface is called an–
intrusive igneous rock
What factors help determine whether a volcanic eruption will be violent or relatively quiet?
Magma composition
Magma temp
Concentration of dissolved gases
As the rate of cooling of igneous rocks increases, the size of the crystals that form–
decrease
How are the intrusive igneous bodies classified?
Shape, size, and relationship to surrounding rock layers
What plays a major part in determining the form of a volcano?
Magma composition
A rock that forms from cooling lava is classified as an–
extrusive igneous rock
Where do all plutons form?
Below earth’s surface
Which type of intrusive feature forms when magma is injected into fractures cutting across preexisting rock layers?
dike
A magma’s viscosity is directly related to the content of what?
silica
what type of volcano is built almost entirely from ejected lava fragments?
Cinder cone
A highly explosive volcano tends to have what type of magma?
High silica, viscosity, and gas content
What is a volcanic bomb?
A piece of semi-molten rock, ejected as glowing lava
Lava that cools so quickly that ions do not have to arrange themselves into crystals will form igenous rocks with what type of texture?
Glassy
Magma forms when solid rock in the crust and upper mantle does what?
Melts
A volcano that is fairly symmetrical and has both layers of lava and pyroclastic deposits is what type of volcano?
composite cone
The largest intrusive igenous body is called a what?
batholith
When large masses of magma solidify far below earth’s surface, they form igneous rocks that have what type of texture?
course grain
A lava flow with a surface of rough, jagged blocks and sharp, angular projections is called what type of flow?
Aa
What 3 factors affect the melting point of rock?
composition
Water content
confining pressure
Structures that form from the cooling and hardening of magma beneath earth’s surface are called what?
Plutons
What is the term that describes lava’s resistance to flow?
viscosity
What do you call the wide area that forms when low-viscosity basaltic lava flows from fissures?
lava plateau
What is the name of the conduit that feeds magma to a volcano’s surface?
pipe
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