Which direction do parallels run on a map?

Parallels, also known as lines of latitude, run east-west on a map. They are used to measure how far north or south a location is from the equator, which is defined as 0° latitude. Each degree of latitude is approximately 69 miles apart, allowing for a consistent and uniform method of demarcating the Earth's surface.

In contrast, lines of longitude, or meridians, run north-south and are used to measure the distance east or west from the Prime Meridian. Understanding the orientation of parallels is crucial for navigation and map reading, as it aids in determining geographical coordinates and overall spatial awareness. This is why the option indicating that parallels run east-west is the correct choice.