Fracking has many effects on the environment some of these effects are: earthquakes, water contamination, environment around the sites, air pollution. Water pollution is one of the major effects land fracking has on the environment because the chemicals used during the process can affect local water sources or underground reserves. Some air contaminants are : benzene, toluene, xylene and ethyl benzene (BTEX), particulate matter and dust, ground level ozone, or smog, nitrogen oxides, carbon monoxide, formaldehyde and metals contained in diesel fuel combustion—with exposure to these pollutants known to cause short-term illness, cancer, organ damage, nervous system disorders and birth defects or even death. Some effects to our health are 75% of the chemicals could affect the skin, eyes,and other sensory organs, and the respiratory and gastrointestinal systems. Approximately 40–50% could affect the brain/nervous system, immune and cardiovascular systems, and the kidneys; 37% could affect the endocrine system; and 25% could cause cancer and mutations. Also fracking causes many earthquakes most are very small but by continuing fracking the earthquake can get of a bigger magnitude. A study by the U.S geological survey the largest fracking induced earthquake was in Kansas and was felt as far as Memphis on November 12, 2014. It registered 4.9 on the Richter scale.