I'm NOT 100% sure about this answer but I think it's the Lines of Longitude
When a volcano erupts, the molten rock (or magma) that comes out of the Earth is called lava. Because lava is so hot (more than 1,100 degrees C, over 2,000 degrees F), it remains molten and flows across the ground until it cools and hardens into rock.
hope this helps
Answer: Northern Texas northward through Oklahoma, Kansas, Missouri and parts of Louisiana, Iowa, Nebraska and eastern Colorado.
"blocking high views" is not typically a problem associated with urban sprawl, since this urbanization tends to take place on relatively flat levels, which takes up more land.
