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 _____ meridian.

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The 100th meridian is known as the "Great Plains Meridian" and is a significant boundary line for agriculture in North America. West of this line, there is not enough rainfall for crops to grow without irrigation, making large-scale agriculture difficult. This meridian separates the humid regions from the arid and semi-arid regions.

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