Sphere = the shape of a ball (or the
Hemisphere = half of the Earth
Any circle drawn around the Earth divides it into two
equal halves called hemispheres. There are generally
considered to be four hemispheres: Northern, Southern, Eastern, and Western.
The Equator divides the
Earth into the Northern and Southern hemispheres. The Northern
Hemisphere contains North America, the northern part of South America,
Europe, the northern two-thirds of Africa, and most of Asia. The Southern Hemisphere contains most of South America, one-third
of Africa, Australia, Antarctica, and some Asian islands.