New words and phrases Land subsidence地面沉降 differential sinking不均匀沉降 terrain地面 tectonic motion构造运动 ores矿石 extraction采掘 withdrawal of groundwater地下水开采 cavern洞穴 disastrous phenomena灾难性事件 utility lines cracking公用电断电 New words and phrases Land subsidence 地面沉降 differential sinking 不均匀沉降 terrain 地面 tectonic motion 构造运动 ores 矿石 extraction 采掘 withdrawal of groundwater 地下水开采 cavern 洞穴 disastrous phenomena 灾难性事件 utility lines cracking 公用电断电