A butterfly rests on a leaf floating on the surface of a pond. The butterfly then starts moving to the tip of the leaf at a speed of 5 cm s -1 relative to the water. The leaf，in accordance with the principle of conservation of momentum，moves at 3 cm s -1 relative to the water in the opposite direction. If the mass of the leaf is 8g，determine the mass of the butterfly.

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co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

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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