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Half of the earth (the prefix actually means
"half"); the earth is divided into four of these
(example: The equator divides the earth into the
northern and southern these).
Imaginary line of latitude at 0 degrees located
halfway between the north and south poles
Imaginary line of longitude at 0 degrees that
divides the earth into eastern and western
hemispheres
Explains symbols, colors, and other markings on a map