Which of the following ways of telling time made use of sand? answer choices
a. water clocks
b. hourglass
c. sundials
d. clock
a. water clocks
b. hourglass
c. sundials
d. clock
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An hourglass (or sandglass, sand timer, sand clock or egg timer) 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 (historically sand) from the upper bulb to the lower one.