0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
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 characteristics are used to classify igneous rocks?
Intrusive and extrusive factors of an igneous rock classify them. The other factors are if they are vesicular, coarse, fine grained, glassy, or very coarse
Which igneous rocks would be formed by the fastest cooling of lava?
Glassy textured extrusive igneous rock, such as obsidian.
What texture of obsidian?
Obsidian is an extrusive rock that cooled very rapidly without forming crystals. As a result, obsidian has a smooth, shiny texture of a thick piece of glass.
Are river rocks porous?
No. It is a fine grained extrusive volcanic rock that is light in color. It is usually not porous.
A glassy fine grained extrusive rock?
Obsidian
What is a glassy fine-graind extrusive rock?
obsidian
How can you tell that scoria is an extrusive rock?
It is fine grained to glassy and contains vesicles.
What is a glassy grained extrusive rock?
Obsidian.
Is the resulting texture of extremely rapid cooling of lava in which no crystals form?
The texture is really glassy, like obsidian.
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 extrusive igneous rock has a mafic composition and a glassy texture?
Basaltic glass
What is an extrusive igneous rock that is actually glass?
One type of glassy igneous rock is obsidian, which is black and glass-like. Any type of igneous rock that is glassy would be a extrusive rock, which means it was formed outside the earths crust and cooled quickly, making for a fine grain and small crystals. hope this helps
What characteristics are used to classify igneous rocks?
Intrusive and extrusive factors of an igneous rock classify them. The other factors are if they are vesicular, coarse, fine grained, glassy, or very coarse
Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment?
noncrystalline glassy texture
What does intrusive and extrusive mean?
These two terms are used to classify igneous rock. Intrusive igneous rock has solidified from magma, below the surface of the Earth. Extrusive igneous rock has solidified from lava, at or near the surface of the Earth. Intrusive rock displays a coarse-grained rock texture, a result of the slow cooling of magma. Extrusive igneous rock will display either a fine or a glassy texture, depending on the speed of solidification of the lava.
What are the properties of extrusive rock?
They are fine grained.
