What is the process called when earth's surface is broken down into smaller pieces​

Weathering,

Weathering is the process where rock is dissolved, worn away or broken down into smaller and smaller pieces

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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