Which term describes the line on the Earth's surface formed by a plane passing through both poles?

• A. Parallels
• B. Isoplets
• C. Strip camera
• D. Meridian

Answer: (B)

A meridian is the correct term. A plane that contains the Earth's axis intersects the globe in a line that runs from the North Pole to the South Pole. That north–south line on the surface of the Earth is a meridian, the set of longitudes that define how we measure angular distance east or west. Parallels, by contrast, are lines of constant latitude that circle the globe parallel to the equator and do not pass through the poles. The other terms aren’t used to describe this pole-to-pole line.