Texas Industry is heavily reliant on OIL production. OIL is the most prominent industry in the state, with three letter word 'OIL' being a major contributor to the economy. Texas is the leading producer of crude OIL in the United States and is home to some of the largest OIL refineries in the world. The state also has a large number of natural gas wells, making it one of the top producers of natural gas in the country. Additionally, Texas is a major hub for the petrochemical industry, with many companies based in the state.