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the holes in extrusive igneous rocks (lava) are called vesicles. They are formed by gas escaping from the rock when molten, leaving bubbles in the melt which
which may be preserved when the lava solidifies
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Which igneous rock can be intrusive and extrusive?
A porphyritic igneous rock demonstrates some extrusive characteristics and some intrusive characteristics. The appearance of phenocrysts (larger crystals) in a fine matrix (small crystals) indicates that the magma had time to cool slowly enough underground to form larger crystals before being erupted at or near the surface.
Is obsidian intrusive or extrusive?
quartz itself, but you will find fragments of quartz of all sizes in both sedimentary and metamorphic rocks.
How can a metamorphic rock become an extrusive igneous rock?
a metamorphic rock is formed when it is under great heat and pressure and after some time it forms magma. then the mama comes out through volcano and becomes hard , this rock that is formed is known as extrusive igneous rocks.
How are intrusive and extrusive classified?
Intrusive or extrusive describe properties of an igneous rock. An intrusive rock is formed within the crust and it insulated and cooled slowly. Some examples of an intrusive rock include diorite, granite, gabbro, and periodite. They have large grains because they have more time for growth. On the other hand, extrusive rocks cool at the surface rapidly. They are comprised of tiny crystals and/or glass. Some examples include rhyolite, andesite, and basalt.
Is felsic porphyritic extrusive?
Some felsic rocks are and some are not. The term felsic is a description of an ingeous rock's composition, not its texture or where it occurs.
Why are there holes in igneous rock?
The holes represent the bubbles of trapped and expanding gas that was present in the solidifying lava. They were essentially frozen in place.
What kind of igneous rocks for on earths surface?
Some do. These are called extrusive igneous rocks. However a large portion of igneous rocks form beneath the surface. These are intrusive igneous rocks.
How are intrusive and extrusive rock different?
Intrusive Rocks are found underneath Earths crust, while Extrusive rocks are found above Earths crust.
What is category of igneous extrusive rock?
Some igneous extrusive rocks include obsidian, basalt, andesite, rhyolite, scoria, pumice, basaltic glass. If you want more, go to page 6 on the Earth Science Reference Tables at the related link.
Why don't crystals always form in extrusive rocks?
In some cases the molten rock cools too quickly for the atoms to arrange themselves into a crystalline structure.
Which igneous rock can be intrusive and extrusive?
A porphyritic igneous rock demonstrates some extrusive characteristics and some intrusive characteristics. The appearance of phenocrysts (larger crystals) in a fine matrix (small crystals) indicates that the magma had time to cool slowly enough underground to form larger crystals before being erupted at or near the surface.
Is obsidian intrusive or extrusive?
quartz itself, but you will find fragments of quartz of all sizes in both sedimentary and metamorphic rocks.
How can a metamorphic rock become an extrusive igneous rock?
a metamorphic rock is formed when it is under great heat and pressure and after some time it forms magma. then the mama comes out through volcano and becomes hard , this rock that is formed is known as extrusive igneous rocks.
Can a A metamorphic rock become an extrusive igneous rock?
a metamorphic rock is formed when it is under great heat and pressure and after some time it forms magma. then the mama comes out through volcano and becomes hard , this rock that is formed is known as extrusive igneous rocks.
What rock forms from lava?
Extrusive Rocks - From: bellany412:)
Can you find a rock with a natural hole in it?
Some extrusive igneous rocks are vesicular; rocks like pumice and scoria, which could be found at or near areas of current or past volcanism. Rocks of various types are found near seashores which have holes in them. These holes are actually burrows made by organisms.
What rock is a volcano rock?
Volcanic rocks are extrusive igneous rocks.
