What happens when magma cools quickly?

Answer 1

Several different things depending on the speed of cooling:

-Smaller crystals-the less time there is to cool, the smaller the crystals

-vesicles-If the lava cools quick enough, the gas trapped inside the lava doesn't have time to explain leaving gas cavities in the igneous rock.

-glassy texture-if the magma cools quick enough, crystals don't have time to form.

[NB:there may be other causes which I haven't noted which may be added to this answer later in an edit]

Answer 2

The difference in crystal sizes between the two types of formations is of interest to geologists. Quickly cooling lava leaves little time for crystal formation of the minerals in the ensuing extrusive igneous rock. Obsidian, a volcanic glass, sometimes results from extremely rapid cooling of lava. Slower cooling lava will result in crystal formation, albeit small crystal formation, resulting in an aphanitic texture. The largest crystal formation in igneous rock occurs when magma cools underground and very slowly, over hundreds of thousands of years.

Answer 3

When magma cools quickly, it solidifies to form fine-grained rocks like basalt. Quick cooling prevents large mineral crystals from forming, resulting in a more compact and relatively homogeneous rock texture. Rapid cooling can also create features like glassy textures or vesicles (gas bubbles) in the rock.

Answer 4

When Magma cools rapidly, the atoms do not have time to organise themselves into a crystallographic orientation and in so forms Volcanic Glass-Obsidian.

Answer 5

lava is actually molten rock or to put in other words is a kind of "liquid rock"so that when it cools down it becomes solid rock.

Answer 6

When lava cools quickly, the mineral grains don't have much time to set. This causes the rock to be light and porous.

Answer 7

rock