Which outcome was worsened when early Chinese mines used black powder?

💡 Explanation

Mines experienced increased instability due to the incomplete combustion of Sulphur leading to pressure pulses, propagating vibrations because of the **percussion wave**, therefore, mine collapses risks were greater, rather than controlled fragmentation achieved in modern methods.

• Which risk increases when ancient Mesopotamian bronze sickle blades are repeatedly used to harvest reeds in brackish water?
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• Which effect results when excessive hydrostatic pressure exceeded mortar strength during Inca stonework construction?
• Which outcome results when improperly compacted fill is layered for Inca agricultural terracing?
• Which stabilization mechanism prevented collapse in steeply-walled Late Roman castra?
• Which outcome resulted from deficiencies in astrolabe manufacturing circa 1100 CE?