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== == Extrusive igneous rocks are formed from the solidification of lava on or above the surface. Rapid cooling from exposure to air or water results in rapid crystallization of their component minerals, normally creating a fine grained texture as opposed to intrusive igneous rocks which have a coarser texture. Examples of extrusive igneous rocks would include obsidian, pumice, basalt, and rhyolite.
Alexandrine Nienow
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How extrusion forms?
An extrusion is an igneous rock layer formed when lava flows onto Earth's surface and hardens. Extrusions are always younger than the rocks below it.
Can igneous rock sink?
Old, cool igneous rock sinks.
Is granite igneous or metamorphic?
igneous. Made from slowly cooling magma. :)
Igneous rock that forms when magma hardens beneath earths surface is called?
Intrusive igneous rock
How are igneous rocks that have high levels of quartz classified?
A rock is considered igneous if it formed directly from the cooling of molten rock.
What do scientist use igneous intrusions and extrusions for?
they use it for finding new thing
How do scientists date sedimentary rock?
They date the igneous intrusions and extrusions near the sedimentary rock layers.
What evidence would a scientists use to determine the absolute age of a fossil found in sedimentary rock?
The Igneous intrusions and extrusions near sedimentary layers.
Can Unconformities be caused by erosion?
Unconformities are either a feature of deposition or igneous extrusions; and are not as a result of erosion, yet the material making one up may be a product of erosion.
How extrusion forms?
An extrusion is an igneous rock layer formed when lava flows onto Earth's surface and hardens. Extrusions are always younger than the rocks below it.
Can I decide the thickness of the wall when using custom aluminum extrusions?
Aluminum, plastic, and copper are most suitable for extrusions. Thickness can be determined with aluminum extrusions.
Intrusions of the igneous rock are younger or older than the rock layers beneath and surrounding them?
they are younger and extrusions are older. they are younger because the surrounding rock layers had to have been there first in order for it to appear. :)
What is the definition of extrusions?
extruszion
Are igneous rocks strong?
Igneous rocks can be strong due to their interlocking grain textures
What clues tells geologists how extrusions are formed?
I am learning about this in my Science class, and when a geologist looks at an extrusion, they know it's an extrusion because it is Igneous rock, and an extrusion helps tell the reletive ages of the layers around it.
What clues tell geologist how extrusions form?
I am learning about this in my Science class, and when a geologist looks at an extrusion, they know it's an extrusion because it is Igneous rock, and an extrusion helps tell the reletive ages of the layers around it.
What are three types of clues to the relative age of rock layers other than the law of superposition?
To determine relative age, geologists also study extrusions and intrusions of igneous rock, faults, gaps in the geologic record, and inclusions.
