slowly
Diorite rock typically cools slowly underground, giving it a coarse-grained texture. This slow cooling process allows large mineral crystals to form within the rock.
No, extrusive rocks cool quickly because they form on the Earth's surface or in shallow depths where the temperature is lower. This rapid cooling results in small mineral crystals or a glassy texture in the rock.
Yes, magma intrusions stays inside the earth. and this goes relatives slowly.
All rocks have crystals in them, what ever king they are. If they cool down slowly they tend to have bigger ones and if they cool down quickly they have smaller ones. SIMPLES!!
Rock is an excellent insulator, meaning that it loses heat slowly and gains it slowly, so an intrusion loses its heat slowly to the country rock, and the country rock absorbs it slowly (some of it undergoing metamorphosis). This means that the rock under the surface cools very slowly. On the surface, water and air cause the heat on the surface of the rock to cool very quickly, forming an noticeable chilled margin. This means that in a lava flow, for example, the surface cools to form something that looks solid, whereas underneath it can still be flowing. Inevitably the lava underneath will cool too, and more quickly than underground, as it is nearer to the cool atmosphere.
Rapidly
Igneous rocks that cool slowly have larger crystals because there is more time for the crystals to grow and develop before the rock solidifies. In contrast, rocks that cool quickly have smaller crystals due to limited time for crystal growth during the rapid cooling process.
Intrusive rocks cool more slowly than extrusive rocks because they are formed beneath the Earth's surface. This slower cooling allows for larger mineral crystals to form within the rock.
Rhyolite is an igneous rock that has formed from rapidly cooling lava or ash.
big
No. Granite cools relatively slowly; its large crystals are one method of observing this. Granite is referred to as a "phaneritic" igneous rock, meaning that it is coarse-grained. Coarse-grained rocks cool slowly, which means that the minerals have time to form large crystals before the rock solidifies. A rock with the same composition as granite that does cool quickly is called rhyolite.
If you are asking about how they were formed magma from volcano that are shot in the air of quickly spewed out causing the magma to cool very quickly forming a very smooth surface on obsidian. Becuase the magma cooled so fast it couldn't slowly cool into a rough textured rock.