接踵而至的火山岩在遇到已冷却的熔岩时便被阻隔堆积起来，由此渐渐构成一个球茎状的岩石块。
The cooled lava ACTS as insulation for the lava coming behind it, and the form slowly grows into a bulbous-like chunk of rock.
岩浆能喷发出地表，并通过火山峰顶形成熔岩流(大多情况会形成火山口)，但它也能通过火山山体侧面的火山岩圆顶和侧面出口喷发出来。
Magma can erupt to the surface and form lava flows through the volcano's summit (frequently forming a crater), but it can also erupt from lava domes and flank vents along the volcano's sides.
而熔岩沉积物又使一些地方火山岩岩层厚达20米(65英尺)。
Subsequent lava flows deposited volcanic rocks up to 20 meters (65 feet) thick in some places.
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