Igneous rocks formed at the surface will cool quickly. Will they have large or small crystals?
that is my Qusetion
It varies. Sometimes the igneous rocks will have large crystals, yet others will have small. Like I said, it varies on the kind of minerals being mixed together to make that igneous rock.
Crystals take time to form, since the molecules have to line up and link. Rapid cooling does not allow enough time to form large crystals.