Sedimentary
Sedimentary rocks are made of compacted sediment that had been weathered away into rivers and compacted together until it becomes a solid rock. It is quite a land process and can often take hundreds of years.
meamorphic
Metamorphic rocks are formed when great heat and pressure are aplied to an existing rock, this heat and pressure will change the rock physically.
Ignious
Ignious rocks are formed when a rock melts and is turned into magma. When the magma cools it forms into a Ignious rock.