A coil of wire that is wrapped around the iron core of an electromagnet is known as a(n) . resistor
extension
armature

it has to be b, about 97 percent.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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