Collier cone, a cinder cone, at the north base of north Sister.
科利尔圆堆,一个煤渣堆,在三姐妹山北峰的北侧山脚。
The hardened lava extends some 4 miles (6 kilometers) from the cinder cone, and is about 100 feet (30 meters) thick.
变硬的火山岩一直延伸到离火山灰锥4英里(6公里)远的地方,厚达100英尺(30米)。
SP Crater is a cinder cone, a conical structure made up of volcanic fragments, often glassy rocks containing bubbles of trapped gas.
火山灰锥,这种锥状结构通常由含有气泡的、透明光亮岩体组成。
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