When magma is cooled, it forms an igneous rock. When magma is cooled rapidly, that igneous rock is of the category called "extrusive" or "volcanic". When the magma is cooled very rapidly, the extrusive igneous rock formed will probably be holohyaline (glassy) in texture, or foamy like pumice.
However if you take an igneous rock that is already rock and cool that very rapidly it will probably shatter owing to thermal stress. That might result in the formation of tuff.
Texture relates to how large the individual mineral grains are in the final, solid rock. In most cases, the resulting grain size depends on how quickly the magma cooled. In general, the slower the cooling, the larger the crystals in the final rock. Because of this, we assume that coarse grained igneous rocks are "intrusive," in that they cooled at depth in the crust where they were insulated by layers of rock and sediment. Fine grained rocks are called "extrusive" and are generally produced through volcanic eruptions.
Aphanitic texture. Not sure if spelled correctly
This is a glassy texture.
The texture would be glassy.
Igneous rock is formed from solidified and cooled magma or lava.
Igneous rock is formed.
Igneous rock is formed from the solidification of magma as it cools.
Obsidian is an extrusive igneous rock, formed from rapidly cooling lava.
An igneous rock formed from magma is intrusive.
it is an extrusive rock
Igneous rock is formed from solidified and cooled magma or lava.
Igneous rock is formed.
Igneous rock is formed from lava that has cooled and, of course, hardened.
what type of rock is formed from magma and cooled on earth surface
Is called igneous rock.
Igneous rock.(obsidian)
the structure of an igneous rock is metamorphic rock that has been heated rapidly and turned into magma then cooled to create igneous rock its gay
A rock that is formed when magma cools is called a igneous rock.
No the rock may have cooled underground but yes all igneous rock was once magma.
Igneous rock is a result of cooled lava or magma.
Igneous rock. the definition of igneous: Formed by solidification from a molten state.