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When a magma cools down, it becomes a solid. Various atoms "prefer" to be arranged in a crystallic way. So when a magma cools down, crystals start to form and grow. Crystals only grow at their edges, so to make the crystal grow larger, it would need more time to do so. Magma's that cool slower have more time for the crystals inside them to grow, so the crystals will be larger, compared to a magma that cools quicker, or even a magma that comes out of the ground (then called a lava).
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What does grain-size tell you about the cooling history of a rock?
Slower rates of cooling will create larger crystals. Rapid cooling allows little time for element accumulation in the crystal, therefore, the crystals created will be smaller. Larger, visible crystals in igneous rock indicate that the magma was slow cooling, usually at depth. Much smaller crystals in igneous rock indicate rapid cooling of lava, usually at or near the surface. Crystals in igneous rock will grow larger and have more time to accumulate material for their growth the more time they have at their crystallization temperature.
Why do plutonic rock and volcanic rock have big and small crystals respectively?
The size of the crystals is a function of the rate of cooling of the molten rock. The faster the molten rock cools, the smaller the crystals will be.
Why do some igneous rocks have larger crystals but other igneous rocks have crystals so small they have to be seen with a microscope?
Crystal size in igneous rock is dependent on the amount of time spent in cooling from magma or lava. More time means larger crystals. Rocks that have small crystals cooled quickly, so the minerals didn't have time to rearrange and form large crystals before the rock solidified. These small-crystalled rocks are described as aphanitic. Other rocks cooled slowly, so the minerals had time to rearrange and form large crystals before solidifying. These rocks are considered phaneritic. Some rocks cool slowly for a while, and then experience rapid cooling (such as magma that cools slowly inside a volcano, and then cools rapidly when the volcano erupts). Such rocks have large crystals surrounded by tiny crystals. Rocks that form this way are described as porphyritic.
What is slate's grain size?
Slaet in grain size is the size of sand crystals.
How are grains related to texture?
Grains in igneous rocks determine the rock's classification. They can be classified as:pegmatitic: very large crystalsphaneritic: rocks contain minerals with crystals visible to the unaided eye, commonly intrusiveaphanitic: rapid cooling, crystal nucleation and growth is stunted, forming a uniform, fine grained rockporphyritic: containing phenocrysts in a fine groundmassvesicular: contains voids caused by trapped gas while coolingvitreous: glassy or hyaline without crystalspyroclastic: rock contain fragments of crystals, phenocrysts and rock fragmentsequigranular: rock crystals are all the same size
How will cooling affect maple syrup crystal size?
Fast cooling=small crystals Slow cooling=big crystals
What is the best evidence for determining the cooling rate of an igneous rock during its solidification is provided by what?
The best evidence for determining the cooling rate of an igneous rock during its solidification is provided by examining the size and distribution of mineral crystals within the rock. Fast cooling rates result in smaller crystals, while slow cooling rates result in larger crystals. Other indicators can include the presence of chilled margins, which are fine-grained outer edges of the rock that form during rapid cooling.
What determines how large the crystals in an igneous rock will be?
The cooling rate of magma determines the size of crystals in an igneous rock. Slow cooling allows larger crystals to form, while rapid cooling results in smaller crystals or a glassy texture. Other factors such as mineral composition and amount of available space for crystal growth also influence crystal size.
What is the main factor that affects the size of minerals in igneous rocks?
Crystal size is largely dependent on the time the magma takes to cool and solidify. Slow cooling equals large crystals. Fast cooling equals small crystals.
The size of a mineral's crystals depends on which of the following?
The size of a mineral's crystals depends on factors such as the rate of cooling, the presence of impurities, and the availability of space to grow. Slower cooling rates typically result in larger crystals, while faster cooling rates produce smaller crystals. Impurities can impede crystal growth, while a lack of space can limit crystal size.
What determines how large the crystals and an igneous rock Will be?
The speed at which the magma/lava cools ie. fast cooling = not much time for crystals to form = little or no small crystals slow cooling = much time for crystals to form = big crystals
Igneous rocks may be similar in mineral composition and yet have different?
texture due to variations in cooling rate. Slow cooling can result in larger mineral crystals forming, while fast cooling can lead to fine-grained or glassy textures.
As the rate of cooling of igneous rocks increases the size of the crystals that form .?
The size of crystals decreases as the cooling increases. This is called an inverse relationship.
What determines crystal size in an igneous rock?
It depends on the cooling of lava. Slow cooling forms big crystals deep under the surface while fast cooling creates small crystals on or just below the earths surface. Itstant cooling wouls have no crystals.
How does the speed of cooling of molten rock affect the size of crystals that form?
Faster cooling leads to smaller crystals, while slower cooling results in larger crystals forming. This is because faster cooling prevents the atoms and molecules in the molten rock from aligning into orderly crystal structures, resulting in smaller crystals. Slower cooling allows more time for the atoms to arrange themselves into larger crystal structures.
What determines the size of the crystals that form in a sample of granite?
Crystal size in igneous rock is predominately a factor of time spent in cooling from lava or magma. Samples with relatively large crystals are the result of the magma having spent a longer amount of time at ideal crystal forming temperatures for each mineral present.
. As the rate of cooling of igneous rocks increases the size of the crystals that form?
The size of crystals decreases as the cooling increases. This is called an inverse relationship.
