When a skier skis down a hill, the normal force exerted on the skier by the hill is When a skier skis down a hill, the normal force exerted on the skier by the hill is less than the weight of the skier. greater than the weight of the skier. equal to the weight of the skier.

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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answera compound;

conservation of mass

mass before something happens = mass afterwards