How is oil extracted from underground

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shock wave = a sudden wave of increased pressure or temperature, caused by an explosion, an earthquake, or an object moving faster than the speed of sound

casing = a cover or shell that protects or encloses something

hydraulic fracturing = a method used to extract natural gas and oil from deep rock formations known as shale

EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.