Why did book on the shelf fall down ??Poem : Wind. Ncert of class 9th
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Items can also fall off of a piece of furniture over time due to tiny forces generated from within the home, things like the vibration from a desktop fan, air conditioner, plumbing, or a nearby washing machine, even a sudden change in air pressure due to opening a door or window could cause an object to topple over.
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The book on the shelf fall down because of the wind blowing in the room...
...hope it helps
plz marks as brainliest dearie....
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