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The ''Sand Clock'' is really called an Hourglass, and the reason for that is because it takes the sand and hour to reach the other end of the glass. An hourglass is a curved shaped object that has two ends. The hourglass Has sand inside it which Is placed at the bottom of the hourglass, but when you turn the hourglass up side down, the sand slowly runs through a hole to the other end of the glass. When the sand has finally finished flowing it will end up looking like how it was in the first place.

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