Lines that run from north to south and are measured east to west are known as?

The correct answer is based on the definition of longitude, which refers to the imaginary lines that run from the North Pole to the South Pole. These lines are measured in degrees east or west of the Prime Meridian, which is located at 0 degrees longitude. Longitude helps determine the precise location of a point on the Earth's surface in the east-west direction.

Understanding this concept is crucial in navigation, geography, and mapping, as it allows for accurate positioning regardless of geographical features. The terms latitude and meridian, while related to geographical measurements, refer to different concepts. Latitude refers to lines that run east-west and are measured north to south, while a meridian is simply a term used to describe a line of longitude itself. Horizon lines do not pertain to this geographical coordinate system at all.