What are the invisible lines that create a grid on our planet called?

Los meridianos y paralelos son conceptos geográficos que consisten en líneas imaginarias que se utilizan para orientarse en la superficie de un planeta, como por ejemplo la Tierra.

it is one of the most important farming areas in the united states. along with farming, the region has a huge manufacturing industry. the midwest region's climate and natural resources are important to its economy. the eastern part of the region has a lot of rainfall.