Answer: gas pipe lines
Explanation: There are three major types of pipelines along the transportation route: the gathering system, the interstate pipeline system, and the distribution system. The gathering system consists of low pressure, small diameter pipelines that transport raw natural gas from the wellhead to the processing plant.
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They also engaged in the ceramics Industry, paper making, porcelain making, tea-leaf processing, metallurgical among other activities which helped boost their economy. The people in Tang Dynasty were involved in commercial activities due to developed and improved agriculture and the handicraft industry. Inventions during the Tang dynasty were made in the fields of medicine, engineering, and sciences. Gun powder, gas cylinders and porcelain were among the few inventions during this time. Printing was another big accomplishment during this dynasty. The Song Dynasty (960–1279) of China was a period of Chinese history marked by commercial expansion, economic prosperity, and revolutionary new economic concepts. Private trade grew and a market economy began to link the coastal provinces with the interior. Hope this helps!
C, I believe.
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