The line,extending roughly between the eastern edge of the Panhandle down to the Rio Grande northwest of Laredo and marking the area where agriculture is not possible without irrigation,is the

Question

Quizplus · Accepted Answer

The line described is commonly known as the "100th meridian" and is considered to be a defining point for the geographic boundary of the Great Plains region in the United States. East of the 100th meridian, humid conditions allow for more productive agriculture without the need for irrigation, while west of the meridian, arid conditions require irrigation for agriculture to be viable.

The Line,extending Roughly Between the Eastern Edge of the Panhandle