Answer:
Over millenia, these rocks get pushed back into the Earth's mantle, and get pushed into a volcano heating it up and turning it into magma.
Explanation:
Magma is molten rock, meaning existing rocks must be getting melted, the way the melting happens is by the rocks getting pushed into the ground by landforms and penetrating the mantle, this is how the cycle starts all over again.
I just translated this question, but I'll be giving you English answer so just translate it as well in your language.
In a residence with no basement, a dorm, or an apartment: Avoid windows. Go to the lowest floor, small core room (like a bathroom or closet), beneath a stairwell, or in an indoors hallway with no windows. Crouch as low as feasible to the floor, going through down; and cover your head with your hands.