The Prime Meridian is an example of a line of longitude. Longitude lines tell you whether you are in the Eastern or Western Hemisphere. They also tell you how far east or west you are.
Focus: A Handbook for Teachers of Intermediate Social Studies
Based on the maps you've looked at before, is the United States east or west of the Prime Meridian?
Look at the page with hemispheres if you want to refresh your memory.
Click on the NEXT button to follow Dr. Globe and learn about degrees of latitude and longitude.
