how many grains of sand are there in the world, about?
448118
Oh jeeze, are you serious LOL.......ok lets say: 999,349,843,928,999,344,576,345,768,324,999 gazilliontrillionbazillion........
741168
B.Clay\nClay is generally particles < 2 micrometres, sand somewhere around 100 micrometres, and gravel rather in the millimetre range.\n\nA. wind erosion\nToday's (Tuesday, 14th Nov 2006) weather news show nice satellite images with dust vanes across the Canary islands. Forecasts say that some of the fine dust might even reach South America with the Passat winds. The seas before the Sahara have high sedimentation rates of desert dust.\n\nD. O-horizon\nO for organic.
1186435
Yes..........We are inside a gigantic grain of sand that is on a gigantic beach in another gigantic world........and so on and so on and so on.......never ending!!
1139774
That would be absolutely impossible to answer with an exact number.  First, if you mean insect species, there are many that are undiscovered.  If you mean absolute total number of every insect, well, I don't know that anyone could even come close to a real estimate, let alone an actual number.
631787
The number is less than the mass of the Earth's mantle divided by the average mass of a sand particle. According to http://www.astro.wisc.edu/~ewilcots/astro236/drakeandrichter.pdf, the mass of the Earth's mantle is around 1.4*10^24 grams. According to http://www.ma.iup.edu/~hedonley/drag/drag25.html the mass of a sand particle is around 1.7*10^(-7) grams.\nThus the amount of particles in a mantle made up completely of sand would be around (1.4/1.7)*10^31 = 8.2*10^30. In America, this would be called 8.2 nonillions by the nomenclature-obsessed minority. Since the mantle is not made completely up of sand particles, the number of sand particles is less than this number, and since that number is less than infinity, so is the number of sand particles. It is thus an unknown, but finite, number.\n\nPS: Note that a "zillion" is not a real number. It is a fictitious play on the way we name large numbers and does not correspond to any exact amount. See http://www.google.com/search?hs=Xwl&hl=en&lr=&safe=off&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=define%3Azillion&btnG=Search .
330303
count sand grains while lyin on the beach tanning ourself!
20876
Asia Only          364,270,713  \nRest of the World  653,786,676\nWORLD TOTAL        1,018,057,389\n\nhttp://www.internetworldstats.com/stats3.htm
1085840
Since you've extended the question to ALL possible sand grains in the universe and not just on Earth, there are implied answers.\n\nSince we can only estimate the number of both, it's also a moot point.\n\nFor the record, the further we are able to see, the more stars we see - in every direction, so the potential for the number of stars is infinite. Check out the Hubble Space telescope deep space field..\nhttp://hubblesite.org/newscenter/newsdesk/archive/releases/1996/01/\n\nSand has so far been verified on only 3 planets (Earth, Venus and Mars) . The Outer planets cannot be verified as having sand, since they have extremely dense atmospheres. There are, however, several moons and asteroids which have sand sized material.\n\nHaving said that, there exists the potential for there to be more sand grains than stars, since there exists the possibility of planets (and other objects which may have sand) around every star.\n\nWe don't know how many stars have planets. If only 1 out of 1 million stars have a planet with sand as is found on Earth, sand would win.\n\nIf you limit your question to sand on Earth as opposed to stars in the universe, stars win big.
863404
The gravel chips have density about 2.9 to 3.0 gm/cc.  The problem is estimating their packing factor.  Using 0.55, we have say 1.62 gm/cc therefore 1.62 tonne per cubic metre.  The actual chip size doesn't come into the calculation, so sand ought to be the same, except that if the grain size varies a lot then the packing factor could maybe go up to 0.65 as small grains fill the spaces between larger grains, but still just under 2 tonne/m3.
684242
how many grains of sand on a beach? who knows but we should all enjoy the competition
1177435
Let's do a quick calculation. If a grain of sand is 1 millimeter across, there would be 1000 laid end-to end to make a meter, so 1,000,000 to make a kilometer. That is 10^6. To make a cubic kilometer would take (10^6)^3=10^18 grains (approximately).\n\nNow, water has a molecular weight of 18 amu and so a mole of water weighs 18 grams. This will fill 18 cubic centi-meters. One ounce is about 30 cc, so a cup would be about 240 cc, so about 13 moles. So, in that volume of water, there will be 13 times Avagadro's number of water molecules. This is about 8*10^24 molecules.\n\nDividing, there are as many water molecules in a cup of water as there are grains of sand in 8,000,000 cubic kilometers. So now the question is how many cubic kilometers of sand are there in the world?\n\nWell, the earth has a radius of 6*10^3 kilometers, which gives a total surface area of 4*pi*(6*10^3)^2, or  about 5*10^8 square kilometers. Dividing again, we see that the average depth of sand to have the same number of sand grains as molecules of water in a cup is about 1.6*10^(-2) kilometers, which is 160 meters.  This seems roughly right, so I would say that there about about the same number of grains as there are molecules.\n\nI hope this helps!
709136
Dude...the question still can't be answered unless you know the density of grain.  Is that not given?
9878
193 Countries in the world.  There are colonies and territories that may be incorrectly noted as countries, but they are not independent intities. \n\nRead more at the link below.
49840
There are 7.\nAntarctica, North America, Asia, Europe, Australia, Africa, South America
421114
Globally, 12,672. Believe it or not.
660411
I don't agree. The desert is more than sand. it's a whole enviroment.\n\nHe may wants to say that size doesn't matter. ofcourse a handful of sand is a desert to bacteria!
165445
there are 7241.00098723 earths. Period.