9. Meridians west of the Prime Meridian are labeled with the letter __ 10. Meridians east of the __ 11 Ameridian is a line of __ 12. Distance east or west of the Prime Meridian is measured in degrees of __ __ __

9. Meridians west of the Prime Meridian are labeled with the letter "W" (West).<br />10. Meridians east of the Prime Meridian are labeled with the letter "E" (East).<br />11. The Prime Meridian is a line of 0 degrees longitude.<br />12. Distance east or west of the Prime Meridian is measured in degrees of longitude.