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]
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.
When Magma cools rapidly, the atoms do not have time to organise themselves into a crystallographic orientation and in so forms Volcanic Glass-Obsidian.
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.
When lava cools quickly, the mineral grains don't have much time to set. This causes the rock to be light and porous.
rock
it would be lava , magma is in the ground and flows on earths surface and cools to lava
alright, if it cools quickly it will form pumice because of the bubbles in it. if it cools slowly, it will form obsidian.
It happens when lava is on the outside the cools down to form EXtrusive rock.
The center of the earth is the hottest, and the crust is the furthest away from that heat.
Magma is molten rock, as the magma cools the minerals crystallize out of it, the slower it cools, the larger the crystals.
It forms igneous rock.
it cools
Lava will cool quickly compared to underground magma.
Yes.
I cant tell!
yes
it would be lava , magma is in the ground and flows on earths surface and cools to lava
alright, if it cools quickly it will form pumice because of the bubbles in it. if it cools slowly, it will form obsidian.
No. Granite cools from magma deep underground. Volcanic glass cools quickly at or near the surface.
it forms igneous rocks
Large and coarse textured minerals are formed.
It cools and solidifies into a sedimentary rock.