Which statement about longitude and latitude is true?

• A. Lines of longitude cross the Equator at right angles
• B. Lines of longitude are parallel to the Equator
• C. Lines of latitude cross the Equator at right angles
• D. Longitude lines run east-west and latitude lines run north-south

Answer: (A)

Longitude and latitude form a global coordinate system that helps us locate any point. Latitude lines run east–west around the globe and measure how far north or south you are from the Equator. Longitude lines run north–south from pole to pole and measure how far east or west you are from the Prime Meridian. Since one set goes north–south and the other goes east–west, they intersect at right angles. The Equator is a latitude line at 0 degrees, so lines of longitude cross it at right angles. This perpendicular intersection is what makes the grid reliable for navigation and chart reading.