When you looking at a globe or ball, you can only see on;e see one half of it as the rest is behind the visible area. It doesn't matter from which direction you look (top, bottom, any side), the part of the ball or globe you can see is half of the sphere, also called a hemisphere.
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Why can we see only one hemisphere at a time on a globe?
A hemisphere is one example.
-- hemisphere -- cone -- semifootball
A hemisphere is exactly 1/2 of the earth. We speak of the Western Hemisphere, the Eastern Hemisphere. the Southern Hemisphere, and the Northern Hemisphere.
Right, or left hemisphere.
A hemisphere as two faces (one curved and one plane), one edge and no vertices.