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The particle size (grain size--crystal size) in igneous rock is largely dependent on the amount of time spent cooling and solidifying from molten rock. If cooled quickly, crystals will have little time to grow. Slow cooling allows time for larger crystal growth.
Wiki User
∙ 10y ago
Wiki User
∙ 15y agoIgneous rock often has crystal growth, after many years of cooling from lava deposits. Since there is little time, igneous rock appears fine-grained from the outside. From the inside it will appear coarse-grained though.
Wiki User
∙ 13y agoGenerally earthy tones and if split they have layers in them
Wiki User
∙ 12y agoit look like a magam
Wiki User
∙ 12y agoRock formed from melted rock.
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How do igneous rocks that form from cooling lava differ from igneous rocks that form from cooling magma?
The difference between the two lies in the mineral crystal size. Rocks that form from lava on the surface will cool quickly, with little time for crystal formation. Rocks that form from magma below the surface will cool slowly, resulting in larger mineral crystals. Chemically, they could be identical.
Are the minerals which appear in metamorphic rocks largely the same as those in igneous rocks?
The minerals which appear are quite similar chemically but not physically. In metamorphic rocks, foliation can be seen-bands of rocks formed by great pressure, whereas in igneous rocks, this is never present because igneous rocks specifically need to have just previously melted, so therefore, these bands are disorganized and lost. Therefore, igneous rocks clearly don't seem to have any patterns unlike metamorphic rocks. Also, some minerals only form during metamorphism/melting+cooling. Therefore, the chemical composition is usually slightly different. E.g. Garnet is only formed under high-grade metamorphism-high temperatures and pressures. Also, the crystals sizes in igneous rocks depend on how long the rock has had to cool. So therefore, an igneous rock's crystals could be a lot bigger or smaller than a metamorphic rock's crystals. But then again, both rocks have interlocking crystals unlike sedimentary rocks, so in that way, at first glance, they can sometimes look very similar, (depending if it is intrusive of extrusive-metamorphic rocks will look a lot more like intrusive igneous rocks because of how the air affects the magma, (how magma looks when it cools), extrusive rocks look different, (blacker, smaller crystals etcetera).
Why aren't igneous rocks a good place to look for fossils?
You rarely find fossils in igneous rock for one reason. Igneous rocks are formed from the cooling and solidification of magma or lava. Most living material is destroyed by the heat leaving no recognizable fossil.
What does rock composition mean?
Igneous rock composition basically means how the rock would look if you were to cut it in half. In the case of igneous rock, you would see the different layers of rocks that have melted with it.
What do rocks look like when they have crystals?
There are many types of rocks and they do not all look alike. Colors vary. Some have more than one color, like granite or marble that can have many colors. Some are smooth, like those that have been in a river for a while and have had the rough edges worn off, and some are jagged. Rocks come in all shapes and sizes.
What Evidence Would You Look For If Attempting To Classify A Piece of igneous Rock as Extrusive?
Extrusive igneous rocks have very small crystal grains.
What do extrusive rocks look like?
it look like a magam
Why do extrusive rocks look like shiny black glass?
they dont
How does Igneous rocks look like?
beans and a sausage
Why don't igneous rocks look like magma rocks if igneous rock is formed from magma?
Because that is the very definition of igneous rock.
How do igneous rocks can become sedimentary metamorphic and igneous rocks?
Im learning this in school, and the answer is look for a "rock cycle" and that answers all questions like yours :)
What do a entrusive ingneous look like?
I think it is "extrusive Igneous rock". Well, the magma,the hot liquid earth material which flows out through a vent(ways or cracks in the earth's crust), if on coming over to the surface of the earth, cools or solidifies, it is called "extrusive rock". If the magma, cools before coming over to the surface of the earth it is called "intrusive rock". the rocks formed this way are generally Igneous rocks. More detailed answer may follow.
Igneous rocks can look very different depending on?
Igneous rocks look different depending on how fast the magma cools.
How do igneous rocks that form from cooling lava differ from igneous rocks that form from cooling magma?
The difference between the two lies in the mineral crystal size. Rocks that form from lava on the surface will cool quickly, with little time for crystal formation. Rocks that form from magma below the surface will cool slowly, resulting in larger mineral crystals. Chemically, they could be identical.
Are the minerals which appear in metamorphic rocks largely the same as those in igneous rocks?
The minerals which appear are quite similar chemically but not physically. In metamorphic rocks, foliation can be seen-bands of rocks formed by great pressure, whereas in igneous rocks, this is never present because igneous rocks specifically need to have just previously melted, so therefore, these bands are disorganized and lost. Therefore, igneous rocks clearly don't seem to have any patterns unlike metamorphic rocks. Also, some minerals only form during metamorphism/melting+cooling. Therefore, the chemical composition is usually slightly different. E.g. Garnet is only formed under high-grade metamorphism-high temperatures and pressures. Also, the crystals sizes in igneous rocks depend on how long the rock has had to cool. So therefore, an igneous rock's crystals could be a lot bigger or smaller than a metamorphic rock's crystals. But then again, both rocks have interlocking crystals unlike sedimentary rocks, so in that way, at first glance, they can sometimes look very similar, (depending if it is intrusive of extrusive-metamorphic rocks will look a lot more like intrusive igneous rocks because of how the air affects the magma, (how magma looks when it cools), extrusive rocks look different, (blacker, smaller crystals etcetera).
How is Intrusive igneous rock different from extrusive igneous rock?
The main characteristic to look for is mineral crystal size. Extrusive rock will exhibit an aphanitic texture, where individual crystals are not visible without magnification. Intrusive rock will exhibit phaneritic texture, where individual crystals are visible without magnification.
Why shouldn't you look for fossils in igneous rocks?
Well, Igneous Rocks are formed from Magma and the bones of an animal or a plant wouldn't have the time to become a fossil
