For a rock to be classified as an igneous rock it must have been formed by a volcano. So, it could be made out of cooled magma or lava. The different types of igneous rocks are due to different cooling processes. It could have been spewed into the air and cooled on the way down, it could have been underwater and cooled immediately, or it could have oozed out of some crack and cooled slowly. Another way it may have solidified is by a decrease in pressure. For example, being spewed into the air and falling a couple hundred feet.
The process is; heat, and pressure.
In order to get an igneous rock from a sedimentary rock, the sedimentary rock must be melted and then that melt must crystallize.
it has to go through melting and solidification in order to become an igneous rock.
It solidifies.
Sedimentary rocks can change to igneous rock when it goes through the rock cycle so a sediment can move to igneous rock where there is a volcanic activity happens making the the sediment get heat and pressure that makes igneous rock.So when you do the rock cycle you can go from igneous rock to a metamorphic rock.
Metamorphic rock can not become igneous rock, however igneous rock can become metamorphic. This process happens over time as the rocks are shifted, compressed and heated by the Earth.
Melting and crystallization.
The transition form magma to rock is a process of cooling.
The process is; heat, and pressure.
sedimentary rock
When igneous rocks are crushed and compacted into sediment
Metamorphic rock continues to heat and eventually melts and becomes igneous rocks.
In order to get an igneous rock from a sedimentary rock, the sedimentary rock must be melted and then that melt must crystallize.
The process that must occur to change any rock to igneous rock is melting.
Weathering and erosion
melting and crystalization
The rock becomes a metamorphic rock