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Would you list intrusive rocks under rocks that form above the ground or below?
Intrusive rocks are Igneous rocks that have been formed underground. Igneous rocks are formed by the cooling of lava/magma. Igneous rocks are divided into two categories- intrusive and extrusive. Intrusive is when the magma cools slowly beneath the Earth's surface, which causes large crystals to form. When lava cools above the Earth's surface, it is called extrusive. Extrusive rocks have smaller crystals compared to intrusive, the difference always being noticable.
Why it would be easier for geologists to study extrusive igneous rocks than intrusive igneous rocks?
Since extrusive rocks are formed by lava (not magma), the rocks can be found easier because they are on the surface, whereas intrusive rocks are formed underground so they are either harder to get to or they are found in smaller quantities.
Does the igneous rock created in the ice represent an intrusive or extrusive igneous rock?
Yes. It would be intrusive or extrusive depending on whether it cooled slowly--below the surface, or quickly--at or near the surface, from molten rock.
Is glassy igneous rocks intrusive or extrusive?
Granite gneiss is a metamorphic rock and would not be considered extrusive (rock formed from molten material at or near the surface).
What type of rock is made from magma cooling?
If a magma of higher temperature cools down, certain minerals solidify first. Eventually, those minerals that remain liquid at the lowest temperatures solidify the latest. The rock that is then formed is Granite (if it's intrusive), or Rhyolite (if it's extrusive)
Does intrusive rocks have smaller minerals than extrusive rocks?
No. Intrusive rocks have larger crystals because the magma would have taken longer to cool and solidify than extrusive magma.
How do you tell if a rock is intrusive?
Intrusive rocks are formed from cooling magma beneath the surface. The opposite would be an extrusive rock, these rocks form from lava cooling on the surface of the earth.
Would you list intrusive rocks under rocks that form above the ground or below?
Intrusive rocks are Igneous rocks that have been formed underground. Igneous rocks are formed by the cooling of lava/magma. Igneous rocks are divided into two categories- intrusive and extrusive. Intrusive is when the magma cools slowly beneath the Earth's surface, which causes large crystals to form. When lava cools above the Earth's surface, it is called extrusive. Extrusive rocks have smaller crystals compared to intrusive, the difference always being noticable.
When magma hardens and comes to the earths surface what is it called?
If the magma has hardened before being exposed at the surface it would be considered an intrusive igneous rock. It is hardens at or near the surface, it would be called extrusive igneous rock.
Why it would be easier for geologists to study extrusive igneous rocks than intrusive igneous rocks?
Since extrusive rocks are formed by lava (not magma), the rocks can be found easier because they are on the surface, whereas intrusive rocks are formed underground so they are either harder to get to or they are found in smaller quantities.
How might gneiss change into an igneous rock?
It would have to be melted into the earths magma and cool down as either intrusive (inside the earth) or extrusive (on the Earth's crust) igneous rock.
How might gneiss change into igneous rock?
It would have to be melted into the earths magma and cool down as either intrusive (inside the earth) or extrusive (on the Earth's crust) igneous rock.
Does the igneous rock created in the ice represent an intrusive or extrusive igneous rock?
Yes. It would be intrusive or extrusive depending on whether it cooled slowly--below the surface, or quickly--at or near the surface, from molten rock.
Is glassy igneous rocks intrusive or extrusive?
Granite gneiss is a metamorphic rock and would not be considered extrusive (rock formed from molten material at or near the surface).
What igneous rock would form from magma if it did not reach the surface but instead crystallized?
Intrusive igneous rock would form. Granite is an example. If the same magma that formed the granite had reached the surface through volcanic eruption, the extrusive igneous rock rhyolite would form.
Is lava intrusive or extrusive?
A pluton is intrusive, meaning that it is below ground. Other words to describe a pluton would be batholith or laccolith.
Is obsidian an instrusive or extrusive igneous rock how do you know?
Obsidian is an extrusive rock and is formed from rapidly cooling magma. Obsidian is also known as volcanic glass and one can find only sub-microscopic crystals in it. This is because it was cooled too fastly for large crystals to form. If the material that obsidian consists of were an intrusive rock and had a lot of time to cool down, one would find that it would be composed of easily visible crystals.
