Rock types, rock cycle and other rock information
If the igneous rocks are smashed because of weathering, erosion and so on, it becomes sediment.
Also if the metamorphic rocks or sedimentary rocks are broken, the sediment may be formed.
Sedimentary rocks are formed from sediment when if they compact together.
Then, sedimentary rocks or igneous rocks are changed with heat and pressure,
they change to metamorphic rock.
Finally, igneous, sediment, sedimentary and metamorphic rocks become back to magma,
if they are melted.