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What are the most common intrusive and extrusive rocks?
Some common intrusive rocks include granite, diorite, and gabbro, while common extrusive rocks include basalt, andesite, and rhyolite. Intrusive rocks form beneath the Earth's surface from slowly cooling magma, while extrusive rocks form from rapidly cooling lava on the Earth's surface.
How can a metamorphic rock become an extrusive igneous rock?
A metamorphic rock can become an extrusive igneous rock through a process called partial melting. When metamorphic rock is subjected to high temperatures and pressures, some minerals within the rock may melt while others remain solid. The melted minerals can then rise to the surface through volcanic activity and cool quickly, forming an extrusive igneous rock. This process is known as anatexis, and it can result in the formation of rocks such as rhyolite or andesite.
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.
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 obsidian intrusive or extrusive?
quartz itself, but you will find fragments of quartz of all sizes in both sedimentary and metamorphic rocks.
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.
What are the most common intrusive and extrusive rocks?
Some common intrusive rocks include granite, diorite, and gabbro, while common extrusive rocks include basalt, andesite, and rhyolite. Intrusive rocks form beneath the Earth's surface from slowly cooling magma, while extrusive rocks form from rapidly cooling lava on the Earth's surface.
How can a metamorphic rock become an extrusive igneous rock?
A metamorphic rock can become an extrusive igneous rock through a process called partial melting. When metamorphic rock is subjected to high temperatures and pressures, some minerals within the rock may melt while others remain solid. The melted minerals can then rise to the surface through volcanic activity and cool quickly, forming an extrusive igneous rock. This process is known as anatexis, and it can result in the formation of rocks such as rhyolite or andesite.
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.
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.
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:)
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.
Can an intrusive rock form underground and then become extrusive?
No. But an igneous rock can exhibit a texture which has characteristics of both intrusive and extrusive rock. It's called a porphyry, and results from some slow crystal growth of certain minerals in a magma before being erupted. The product will be a rock with visible mineral crystals which are dispersed in a fine grained background matrix. In some cases, igneous intrusive rock fragments may become trapped in magma of a differing composition and then be erupted onto the surface. These fragments are known as xenoliths and they may undergo some form of alteration due to contact metamorphism. In this case, the rock fragment has been extruded (in the physical sense) with the other molten material, however in geology, the term "extrusive" is generally applied to molten lava which is erupted onto the Earth's surface before cooling. Xenoliths do not exactly fit this definition so it would perhaps be inappropriate to describe them as such. However they can be very important sources of information on the composition of the upper mantle and so are worthy of discussion here. Please see the related links.
