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According to the University of Hawaii's answer:

There are seven quintillion five quadrillion grains of sand on all the beaches of the world. That's a 75 with 17 zeros following!

"75 with 17 zeros following" (7.5x10^18) is seven quintillion, five hundred quadrillion. But what's an extra 495 quadrillion with so many variables in the equation?

Consider more possibilities...

With oceans rising and the deserts expanding, the question of grains of sand on the beach is kind of arbitrary. I think we would do better to ponder a more global picture: an estimate of all "sand" particles on the entire earth's surface, (including that which is covered by salty, briny, or fresh seas and rivers).

Of course "sand" varies by composition, but is defined by size of particle. Tough questions then arise regarding the unexplored ocean floor, which includes a lot of silt (the same composition, but different size per particle than sand). Perhaps we could correct for that based on volume of silt, (or gravel, for that matter), per grain of sand under the sea.

With massive erosion occurring due to water runoff and flooding caused by widespread deforestation, the intractability of the problem becomes as troublesome as estimating the number of stars in the expanding universe. Isn't that the analogy that captures our imagination, anyway - stars versus grains of sand?

But another answer is:

The exact number is not known.

The exact number can't be known to mere mortals. The number of grains of sand is constantly changing as rock is worn away daily into more sand and tons of sand are melted daily to make glass and other products. Then you come to the dilemma of deciding the point at which sand ground fine enough, when do you start to call it dust.

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โˆ™ 2013-11-20 15:46:26
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โˆ™ 2020-05-04 06:13:33

To many to count

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โˆ™ 2020-09-26 03:52:37

At least 3.

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Q: How many grains of sand are there in the world?
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How many grains of sand in the Sahara?

there are 8 octillion grains of sand in Sahara and there are more rocks then sand in the Sahara.

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There are over a billion grainsof sand on a beachThere are more stars than grains of sand

Are there more stars in the universe compared to all the grains of sand from all the beaches around the world?

There are many more stars than there are grains of sand on earth. See link.

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It is pretty clear that it is pretty hard to tell how many grains of sand there are on the beach. But i think there must be billions or millions of grains of sand all around the world. There must be 1,000, 000, 000, 000, 000, 000, 000, and i know there must be alot of sands all around the world.

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Sand is not a compound and haven't a molar mass; also different types of sand exist.

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