When the magma reaches the surface, it is called lava. The rate at which the magma cools determines the kind of igneous rocks that are formed. Faster cooling surface lava creates rock that is fine grained or aphanitic. The rapid cooling doesn't allow large crystals to form. The slower cooling that takes place underground allows larger crystal formation. Granite is an example of this type of rock formation.
Rocks formed from lava (known as extrusive igneous rocks, because the lava comes to the surface) can be any size - large or small. However, the density of the rock and the size of the crystals making up the rock is informative. Less "thick" (viscous) lava will produce higher-density rocks. The more silicon is contained in the lava/rocks, the thicker it will be. Thinner lava contains more iron and less silicon. The faster a lava cools, the smaller the crystals in the rock will be. By using crystal size in minerals, geologists can determine how fast the lava cooled, which helps to determine the type of eruption and the surface conditions when it occurred.
The size of the smallest lava lamp is 11.5 inch
No. Small crystals form.
Yes, the more numerous and larger the crystals are, the more viscous the lava is: it does not, however, have a very dramatic effect.
granite's crystal size varies from 1 mm to 10 mm
Crystal size in igneous rocks is generally a marker for how long magma or lava took to cool and solidify. Larger crystal size is indicative of slow cooling.
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.
Rocks formed from lava (known as extrusive igneous rocks, because the lava comes to the surface) can be any size - large or small. However, the density of the rock and the size of the crystals making up the rock is informative. Less "thick" (viscous) lava will produce higher-density rocks. The more silicon is contained in the lava/rocks, the thicker it will be. Thinner lava contains more iron and less silicon. The faster a lava cools, the smaller the crystals in the rock will be. By using crystal size in minerals, geologists can determine how fast the lava cooled, which helps to determine the type of eruption and the surface conditions when it occurred.
Lava itself is not crystalline as it is liquid. Crystals are solid. However, lava can contain crystals of minerals that have started to solidify.
It depends on the size of the lava lamp
The size of the smallest lava lamp is 11.5 inch
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.
If the magma cools down fastly the crystal size is small because the crystals do not have much time to form. If They magma slows down slowly the crystal size is big because it gives the crystals time to form! :D
No. Small crystals form.
Yes, the more numerous and larger the crystals are, the more viscous the lava is: it does not, however, have a very dramatic effect.
lava
granite's crystal size varies from 1 mm to 10 mm