Although the hot rock of the mantle is a solid, under the tremendous pressure of the crust and overlyingrock of the mantle, it flows like a viscous liquid.
虽然地幔的热岩石是固体，但在地壳和地幔上覆岩石的巨大压力下，它像粘性液体一样流动。
2
The melted rock has a low viscosity, and it flows easily up through the overlyingrock.
被融化的岩石由于粘性较低，因此能轻易流到岩石层上方形成火山锥。
3
It is a key for mine safe production to ensure the stability of overlyingrock strata in stope.