I'm am Timmy the rock. Or right now, Timmy the molten material
Timmy is trapped inside of the Earth's mantle. While Timmy was trapped, he experienced pressure. But that just trapped him in even more.
Rumble, Rumble, Rumble
But eventually, magma is forced up so that Timmy can escape. The eruptes from a volcano as molten material, but will soonbe turned into an igneous rock.
There must be a lot of pressure
But Timmy is soon to find out that crystallized magma was forced up. So he was stuck in the dirt. But not for long. Also while here, he was exposed to deposition. Layers of sediment and dirt piled up on top of him. This means that he is now a sedimentary rock.
Oh boy. Spiders make me want to soil myself.
Sooner or later, Timmy was eventually pushed back in to the Earth's mantle by the evil force (or just to Timmy that was what it was), pressure. Timmy remained there for a long time. He experienced a long cycle of heating and cooling. When he got close the outer core, he would heat up. When he got farther away, or closer to the crust he would cool.
5 years later...
The tectonic plates converge and the oceanic plate subducts under the continental. Timmy is forced up into the continental plate. And he is pushed so far up, he reach's a volcano!