Tooj liab los ntawm kua dej ua kua, feem ntau yog muaj dej, thiab tso tawm los ntawm txias magma. These magma, which is also the basis of eruption, comes from the middle layer between the earth's core and crust, that is, the mantle, and then rises to the earth's surface to form a magma chamber. Qhov tob ntawm chav no feem ntau yog nruab nrab ntawm 5km thiab 15km.

Qhov tsim ntawm tooj liab tso yuav siv kaum txhiab txhiab rau ntau pua txhiab xyoo, thiab hluav taws xob tawg yog ntau zaus. Ib qho kev ua txhaum ua tsis tau yog nyob ntawm kev sib txuas ntawm kev txhaj tshuaj ntawm Magma Magma Magma kev txhaj tshuaj, tus nqi ntawm kev sib tsoo ntawm kev sib tsoo ib puag ncig lub Magma Chamma Magma.

Qhov kev tshawb pom ntawm cov kev sib thooj ntawm cov hluav taws xob loj thiab cov kev nkag siab zoo kom muaj kev nkag siab tshiab ntawm kev tsim ntawm porphyry seediments.