就像在北美大陆被压迫为弓形时发生的，当岩石碎裂时，地表水沿着新的路径流过裂缝。
When rock fractures, as is occurring in the N American continent while it is stressed into a bow, ground water follows new paths through the fractures.
因此，成簇形状（内置微裂纹）可吸收压力一致预防小的裂缝和大的碎裂。
Therefore, "tufts" — built-in micro cracks — absorb pressure in unison to prevent splits and major fractures.
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