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。
Cinder cone volcanoes are formed when magmas with high gas contents and high viscosity are blown high into the air during an eruption.
火山渣锥火山是，当爆发时，高气体含量和高粘度的熔岩被喷发到空气中而形成的。
Collier cone, a cinder cone, at the north base of north Sister. Photo courtesy of the Oregon Department of Geology and Mineral Industries.
科利尔圆堆，一个煤渣堆，在三姐妹山北峰的北侧山脚。照片由俄勒冈州地矿局提供。
Collier cone, a cinder cone, at the north base of north Sister. Photo courtesy of the Oregon Department of Geology and Mineral Industries.
科利尔圆堆，一个煤渣堆，在三姐妹山北峰的北侧山脚。照片由俄勒冈州地矿局提供。
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