Technically, and there isn't an upper and lower half of the world, although maps seem to suggest that. However, there is a northern half and a southern half. These are separated by an imaginary line called the Equator.
The Prime Meridian (zero longitude) stretches from pole to pole, passing through the Greenwich Observatory, London, England. It is the Prime Meridian that divides the globe into East and West hemispheres.
Equator. If you look on a globe you will see a red line going through the middle diving the globe in half making the northern and southern hemispheres.
the answer is the equator
it is important because it divides earth into 2 equal halves.
prime merideane and equator The equator divides the earth into two equal halves.
equator
The Equator...
equator
The equator divides the earth into two hemispheres, northern and southern. Its latitude is 0 degrees.
A cut through any great circle does.
great circle
The Equator is a horizontal line that circles the earth, splitting it into the northern hemisphere, and the southern hemisphere.
diameter
The Equator divides the Earth into the Northern Hemisphere and the Southern Hemisphere. Lines of latitude are parallel to the Equator both to the north and to the south.
The equator divides the Earth into equal halves known as the Northern Hemisphere and the Southern Hemisphere. The equator is an imaginary line that runs horizontally around the globe and is positioned exactly halfway between the North Pole and the South Pole.