The lower part of the mantle between the asthenosphere and the outer core.
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the distance across the middle is the radius and whole distance across it is the diameter
The precise definition of the word 'centres' is the middle point of a circle or a sphere. This means the point is an equal distance from every point on the circle/sphere.
The radius of a sphere is equal distance from the center of the sphere to all points within the sphere.
Sphere is one syllable: sphere.
there are parts of a sphere!!