A Place In River Where Water Spills Suddenly Vertically DownWards
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waterfall, area where flowing river water drops abruptly and nearly vertically (see video). Waterfalls represent major interruptions in river flow. Under most circumstances, rivers tend to smooth out irregularities in their flow by processes of erosion and deposition.
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By crumpling the paper into a ball, the volume of the object decreases but the mass remains the same. Hence its density increases.
As air applies some resistance on falling sheet of paper as well as crumpled ball but the resistance to the motion of crumpled ball through the air decreases that makes it to fall faster than the sheet of paper.
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