Molten rocks called Magma.
Volcano or shield volcano.
Earths crust extend deeper below the continents than below the oceans basins (or at least this is what I think).
crust
the batcave
Tension
It is said that the crust and the inner core are to be solid.
Because the density of the force increases.
The Earths crust is approximately 650 km deep.
The sudden vibration in the plates inside the crust causes the earths crust to rise & fall.
mantle
The earth's crust is not stress
Magma