Basque words that mean hydraulic fracturing process, English fracking, a process whereby extracted gas and oil located in layers thousands of meters deep. The fracking uses water and sand with hundreds of chemical compounds that are injected under pressure to cause the fracture of these strata containing oil and gas. This technique has led to a great international controversy for possible damages environment, as next aquifers and pollution of air, seismic tremors and radioactivity of waste fluids. Some countries have banned it, others did not and international legislation on the subject today is not possible.
