Sentences with phrase «bearing rock layers»
He said while some hyrofracking chemicals are toxic and carcinogenic, public exposure to such chemicals is manageable, and that there are no known cases of the chemicals — which are injected deep underground a mile or more to fracture gas - bearing rock layers — reaching the surface to contaminate water or air.
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In the early 1990s, geologists examined a rock section in China that bore the critical fossils of the P - T boundary interleaved with ashy volcanic layers suitable for isotopic dating.
While the top of the mantle is a sort of fluid sludge, the uppermost layer is rigid rock, broken up into plates that float on the magma - bearing layers.
The most popular explanations today are that it was either born as an inflating half dome of magma squeezed in between subsurface layers of rock or within a conduit deep inside a volcano.
Together with other Triassic layers these rocks — once a seafloor — were now pushed up thousands of meters to become the dramatic high peaks of the new - born Alps.
The specifics: «Artesian water comes from a well that taps a confined aquifer - a water - bearing underground layer of rock or sand - in which the water level is at the top of the aquifer.»
Made of layers of paper dipped in water and ink, chunks of plaster, glass and crystal shards and pieces of rock and quartz, Harnischfeger's wall works bristle with the taut energy borne of multiple materials situated over and against each other: built up, carved into and painted over.