Use the figures on this page and an atlas. 1. a) Which line of latitude is the biggest circle? b) Every line of latitude has a number. The equator is \( 0^{\circ} \). What is the highest latitude on the globe?

The biggest circle on the globe is the equator, located at \( 0^{\circ} \) latitude, as it divides the Earth into the Northern and Southern Hemispheres. The equator is the only latitude line that is a great circle, meaning it has the largest circumference, which is why it’s the most prominent reference in geography. The highest latitude on the globe is \( 90^{\circ} \), which occurs at both the North and South poles. At these points, all lines of longitude converge, and you can't go any further north than the North Pole or south than the South Pole. It’s the ultimate travel destination for those seeking to reach the extremes of the Earth!