Plutonic rocks are intrusive (they solidify before they reach the surface) and have larger crystals because the crystals have had a longer time to accumulate in the heat under the surface.
Volcanic rocks are extrusive (they solidify on or near the surface) and have smaller crystals because the element has less time to accumulate when they cool quickly.
When magma cools, crystals form because the solution is supersaturated with respect to some minerals. If the magma cools quickly, the crystals do not have much time to form, so they are very small. If the magma cools slowly, then the crystals have enough time to grow and become large. The size of crystals in an igneous rock is an important indicator of the conditions where the rock formed. An igneous rock with large crystals probably indicates that the rock formed deep within the Earth, since it is typically warmer deep inside the Earth than near the surface. These are called intrusive rocks, and they have a phaneritic texture. Similarly, a rock with small crystals probably formed at or near the surface and cooled quickly. These are called extrusive rocks and have an aphanitic texture and some magma cools so quickly that no crystals form; we say that these have a hyaline texture.
If it cools faster, smaller crystals are formed. If it cools for longer, larger crystals are formed.
slower cooling results in larger crystals. faster = less crystals because they have less time to form.
Slow cooling of magma results in larger crystals. This is because of the extended amount of time a mineral has at it's crystal formation temperature range.
the slower the magma cools, the larger the crystal size
Ex: Granite rock
the faster the magma cools, the smaller the crystal size
Ex: Obsidian rock
faster cooling, smaller crystals; slower cooling, bigger crystals.
The quicker the molten magma cools (if we are talking about an igneous rock) the smaller the crystals will be and the slower the magma cools the bigger the crystals.
The longer it takes to cool the bigger theve crystals because they have had more time to develope (just finished rocks in science
When igneous rocks cool as magma crystals are large because of the long time it takes to cool. When they cool as lava the crystals are small because they cool quickly.
The size of crystals decreases as the cooling increases. This is called an inverse relationship.
The size of crystals decreases as the cooling increases. This is called an inverse relationship.
When igneous rocks cool quickly, they have small crystals and have a texture that may be described as aphanitic. When igneous rocks cool slowly, they have much larger crystals and have a texture that may be described as phaneritic or pegmatitic.
The rate at which the igneous rock cools controls grain size. Slower cooling results in larger crystals while faster cooling results in smaller crystals.
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.
The size of crystals decreases as the cooling increases. This is called an inverse relationship.
The size of crystals decreases as the cooling increases. This is called an inverse relationship.
The size of crystals decreases as the cooling increases. This is called an inverse relationship.
When igneous rocks cool quickly, they have small crystals and have a texture that may be described as aphanitic. When igneous rocks cool slowly, they have much larger crystals and have a texture that may be described as phaneritic or pegmatitic.
The rate at which the igneous rock cools controls grain size. Slower cooling results in larger crystals while faster cooling results in smaller crystals.
If an igneous rock is formed from slowly cooling magma under the ground, it has more time to form crystals and so the crystals it forms are much larger than igneous rock formed from more quickly cooling magma or lava.
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 to accumulate material for their growth the more they have at their crystallization temperature.
Phaneritic.
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.
A slow rate of cooling. The slower a magma cools, the longer the crystals have to grow, thus the bigger they will be.
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.
the reterded mineral