Igneous Rocks They are forged in fire. Heat energy deep inside the Earth sometimes cause rocks underground to melt.
Metamorphic Rocks They are made from existing rocks that have been dramatically changed by heat and pressure. One way they form is when two of Earth's plates collide and the rocky edges of the plates folded.
Sedimentary Rocks They are made from pieces of sediment coming together and being pressurized.
The rock cycle never ends. That is the reason why we still have coal and all the other minerals still around today.