of rock material; forced out while molten through cracks in the earth's surface
extrusive详细解释
ex.tru.sive adj.（形容词）Tending to push or thrust out.挤出的：易于推出或掷出的Tending to protrude or project.伸出的：易于伸出的或突出的Derived from magma poured out or ejected at the earth`s surface. Used of igneous rocks.喷出的火山的：来自于喷出或喷在地表的岩浆的。用于火成岩
