| 单词 | layer of shale |
| 释义 | layer of shale This formation consists of a 3000ft m layer of shale, sandstone, and silt. Retrieved from Wikipedia CC BY-SA 3.0 The two bodies of water are separated by a layer of shale and thus not connected. Retrieved from Wikipedia CC BY-SA 3.0 When gas or fluids migrate up through the sand and reach this impermeable layer, pressure may build up in the sand and push up against the impermeable layer of shale. Retrieved from Wikipedia CC BY-SA 3.0 The occasional layer of shale also caused construction and conservation difficulties, as this rock expands in the presence of water, forcing apart the stone surrounding it. Retrieved from Wikipedia CC BY-SA 3.0 Fracking involves blasting large amounts of water, sand and chemicals into layers of shale rock deep underground to release trapped natural gas. Times, Sunday Times |
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