Why was the oil derrick built?
http://en.wikipedia.org/wiki/Derrick_(lifting_device)
The oil derrick was built to facilitate the process of drilling for oil. It is a large tower-like structure that is specifically designed to support drilling equipment and machinery. The main purpose of the derrick is to provide a stable and secure platform for drilling operations.
To find information about why the oil derrick was built, you can visit the webpage of the Wikipedia article titled "Derrick (lifting device)" at the provided link. This article discusses the history, construction, and uses of the derrick, including its specific application in the oil industry. Reading through the article will give you detailed information about the purposes and significance of the oil derrick in drilling operations.