lava
Fine crystal grain.
Small crystal grains form when molten rock cools quickly. In an extrusive igneous rock, it's referred to as aphanitic texture.
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.
The same way any solid forms from a liquid - the liquid magma cools off and becomes solid. This usually happens when the magma comes to the cooler surface of the earth as lava, but it can occur very slowly inside of the earth as the magma gradually cools.
formed when molten rocks called magma becomes trapped in small pockets . As these pockets of magma cools slowly underground, the magma becomes igneous rocks
Fine
fine
Fine crystal grain.
Small crystal grains form when molten rock cools quickly. In an extrusive igneous rock, it's referred to as aphanitic texture.
Pumice is made of glass. Glass forms when molten rock cools too quickly for crystals to form.
Small crystal grains form from rapid cooling of magma resulting in an aphanitic rock texture.
When molten rock cools quickly, fine-grained crystals form. This happens because there is not enough time for larger crystals to grow before the rock solidifies, resulting in smaller crystals being formed.
It is mineral
Large crystals with a coarse crystal grain texture.
it forms ingenous rock ...
yes
"Larger than if it cools quickly" is about all that's definitively possible to say.