Question

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what are sand clocks??​

Answer 1

An hourglass is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance from the upper bulb to the lower one.

Answer 2

Answer:

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A sand clock is a device used to measure the passage of time. It comprises wo glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance from the upper bulb to the lower one.

Explanation:

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