Antiphonal
the center of the earth is called the halves of the earth
An antiphony is a piece of music composed and intended to be performed in two halves as responsive singing.
right hemisphere and left hemisphere
they are called the hemispheres
This is called a sagittal plane if divided this way with symmetrical left and right halves. If the section produces asymmetrical halves, this is a parasagittal section.
Hemispheres
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Hemispheres!
usually they are called northern and southern hemispheres
A line of symmetry divides a figure into two matching halves.
lateralization.
The line that separates a shape into two matching halves is called the line of symmetry. When a shape is folded along this line, both halves mirror each other perfectly. In geometric figures, this line can be vertical, horizontal, or diagonal, depending on the shape's orientation.