Prime Meridian,
Equator,
Hemispheres
From NASA: "The Prime Meridian is an imaginary line on Earth that passes north to south through the Greenwich Observatory in London, England.
The Prime Meridian divides the Earth into the Eastern Hemisphere and the Western Hemisphere
The prime meridian is at 0 degrees longitude."
Sandra May,
NASA's Picture Dictionary
For Kids
More about the Prime Meridian and the Equator
Latitude and Longitude games for Kids
Play Rags to Riches: Prime Meridian, Equator, Hemispheres (3rd grade)
For Teachers
Hemispheres worksheet, free from TPT
Equator, Prime Meridian, Lines of Latitude and Longitude pptx, free from TPT
Free Geography Practice and Vocabulary worksheet, free from TPT
Hemispheres Activity, free from TPT
Hemispheres PowerPoint, animated, free