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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.
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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.
How do scientists date sedimentary rock?
They date the igneous intrusions and extrusions near the sedimentary rock layers.
How are faults intrusions and extrusions similar?
Faults, intrusions, and extrusions are all geologic features related to the movement of the Earth's crust. Faults are fractures along which rocks have moved, intrusions are igneous rocks that have been forced into pre-existing rocks, and extrusions are igneous rocks that have been extruded onto the Earth's surface. They all involve the movement and displacement of rocks, contributing to the shaping of the Earth's crust.
What do scientist use igneous intrusions and extrusions for?
Scientists use igneous intrusions and extrusions to study the geologic history of an area, determine the age of rock formations, and understand past volcanic activity. These features can also provide information on the composition and structure of the Earth's crust.
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.
What is the definition of extrusions?
extruszion
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.
Intrusions of the igneous rock are younger or older than the rock layers beneath and surrounding them?
Intrusions of igneous rock are typically younger than the rock layers they penetrate. This is because the magma that forms igneous intrusions is usually injected after the surrounding rocks have already solidified and formed.
Where are extrusions found?
where are egneos rocks found
How can the geologist determine the age of the fossil if the geologist finds a fossil in a layer of sedimentary rock that lies in between 2 igneous extrusions?
The geologist can determine the age of the fossil using relative dating principles. Since the fossil is found between two igneous extrusions, it can be inferred that the fossil is younger than the lower extrusion and older than the upper extrusion. This allows them to estimate the age of the fossil based on the known ages of the igneous rocks.
