Boo settled in the seashore where he undertook deposition for millions of years. As more materials settle on top of him, temperature and pressure increases, making him undergo lithification.
As boo is buried continuously, he reaches the earth's crust. As temperature and pressure increase due to continuous burial and tectonic activity, boo undergoes the process of metamorphism, transforming him into a metamorphic rock.
Temperature continues to increase and exceeds the melting point of Boo. Boo will eventually undergo melting, turning him into magma.
After Boo's first journey that lasted for millions of years, he found himself back to where he came from. He was reunited with his fellow rock friends and family.
This is the end and the beginning of Boo's rock cycle. THE END.