Extrusive rocks are... extruded... onto the surface as the lava that we all think of. It cools fairly quickly, into rocks with fairly small crystals (might need a magnifying lens to see them). The exact chemistry of the parent magma will determine the type of rock. Oceanic volcanoes are generally basaltic (mafic or ultramafic), continental are generally granitic (felsic or intermediate). They're put down in "relatively thin" layers.
Intrusive rocks cool for thousands of years beneath the surface in huge plutons or batholyths. This allows them to grow very large crystals (easily seen by the unaided eye). These intrusive rocks are almost always granitic-type rock.
An extrusion is the forcing out of one material from another. An intrusion is the opposite where one material is forced into / inside or in between another.
intrusion - intrusion is when magma cools down inside Earth.
extrusion - extrusion is when lava cools down on Earth.
by looking at it
they use it for finding new thing
They date the igneous intrusions and extrusions near the sedimentary rock layers.
Because extrusion and intrusions are melted magma that hasn't reached the earth's surface and the hot magma can't just pick up fossils that are already in place.
The Igneous intrusions and extrusions near sedimentary layers.
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. :)
To determine relative age, geologists also study extrusions and intrusions of igneous rock, faults, gaps in the geologic record, and inclusions.
Aluminum, plastic, and copper are most suitable for extrusions. Thickness can be determined with aluminum extrusions.
extruszion
where are egneos rocks found
it look like a magam
Aluminum extrusions are used to turn aluminum alloy into other materials for cross sectional profiles. It is extracted from other metals containing aluminum and squeezed out.