Final answer:
The third-largest industry in Oklahoma in 2010 was the air and space industry, despite the historical significance of oil and gas in the state's economy.
Step-by-step explanation:
In 2010, the third-largest industry in Oklahoma was the air and space industry. While oil and gas have historically been significant industries in Oklahoma, by 2010, the diversification of the economy had shifted some traditional rankings. Oklahoma has been known for its contributions to the aviation, aerospace, and defense sectors, with a notable example being the presence of Tinker Air Force Base, which has a considerable impact on the state's economy.
The sector encompasses manufacturing of aircraft and related parts, repair and maintenance of aircraft, and satellite communications, among other activities. Even though oil and gas still play a major role in the state's economy, sectors such as retail, tourism, and air and space are also key contributors to Oklahoma's economic output.