how many grains of sand is there in the sahara desert?
80739
The Sahara is the world's largest hot desert, over 9,000,000 km² (3,500,000 mi²).  \n\nThe volume of a grain of quartz sand with a diameter of 0.060 mm (a lower bound) is 1.13 x 10^-13 m^3 with a mass of 3.00 x 10-13 g. As an upper bound, the volume and mass of a grain of sand with a diameter of 2.10 mm are 4.85 x 10-9 m3 and 1.28 x 10-8 g.[1].\n\nThe deposits of the modern-day Sahara are generally less than 100 meters thick, though there are some sandy landforms that can reach 450 meters high. (3)\n\nArea of the Sahara: 9 000 000 (km^2) = 9.0 × 10^12 m^2.\nDepth of the sand in the Sahara: approx 100m\nVolume of sand in the sahara: (9.0*10^12)*(100m) = 9.0*10^14 m^3.\nVolume of a grain of sand: 1.13 x 10^-13 m^3\n\nTherefore the # of grains of sand in the Sahara is: (9.0*10^14 m^3)/(1.13 x 10^-13 m^3) = approx 8.0x10^27 grains of sand or 8000000000000000000000000000 grains of sand or 8 octillion grains of sand.
658672
Desert doesn't mean that there is all sand, there are vegetation where oasis are.
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!
397974
FALSE! actually, About one-fifth of Earth's land surface is desert. to that's 20%. : )\n\ntry this link if your not convince. http://en.wikipedia.org/wiki/Desert
595480
France doesn't have a desert. o_o;; They are suprisingly very green.\n\nMajor range is the Alps boarding italy and france.\n\nMajor rivers are the Siene, The Rhine, The Rhone.
76278
There are billions upon billions or trillions of grains of sand on a beach.It would be "normally"\nImpossible to calculate exactly the amount of\ngrains of sand on the east coast.I suppose If you\nwanted to spend years figuring out.First you would\nhave to know the depth (length)and of course the\nwidth(miles of beach)I suppose you can make a general estimation.If you wanted to literly count a \ncup or more of grains of sand with a high powered\nmagnifier.Then if you knew the depth of sand an the \nlength ,you could possibly calculate off of one cup\nof sand and multiply it to that.But then when a wave comes by .It istantly erodes or adds to the beach shore.Therefore your study may be in vain.(lol)\nand thus you would have to determine that
925717
There is a big problem with "how big is a grain of sand?".  Sand is defined as having grains from 1/16 millimetre in diameter to 2 millimetres, a huge factor in volume.\n\nHalf a millimetre is the boundary between "medium" and "coarse" sand.  One such grain would weigh a five-thousandth of a gram, and based on a whole series of "average" or "typical" figure for other properties, it could reasonably be estimated to contain about 8 * 10^17 molecules.\n\n8 * 10^17 grains of that size spread out 1 foot deep would only occupy an area about 9 miles by 9 miles.  I think that all the beaches on earth should beat that quite handily.  However, if you choose the very coarsest sand, it goes up by 64 times as many molecules then 64 times as many of those grains, making about  600 miles by 600 miles which needs a bit more thinking about.  I think the beaches still win, but it's not as obvious.
1161669
Number of restaurants in the middle of the desert = 0.\n\nNumber of mailboxes in the middle of the desert = 1.\n\nNumber of companies willing to ship products to the middle of the desert = 1.\n\nNumber of genius ideas to catch roadrunner in the middle of the desert = Infinite.\n\nDelicious freshly barbecued roadrunner = Priceless.
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 .
939745
Antarctica is the largest "cold" desert.  YES,  it is classified as a desert! It doesn't get rainfall that plants can use it only gets snow.\n\nThe largest hot desert would be the sahara in northern Africa.
546478
It makes up 46ish% of the crust (followed by silicon, aluminium, iron, calcium, sodium, potassium, magnesium and some others).\nIt isn't as abundant in the air though (Nitrogen, Oxygen, Argon Carbon dioxide, others), about 20%.\n\nThe most abundant elements are Hydrogen, Helium, Oxygen, Neon, Nitrogen, Carbon, Silicon, Magnesium, Iron and Sulpher.
914336
desert have become important......what is the question????
68394
There was a study done by a group of Australian astronomers where they calculated (somehow) that there are approximately 70,000 million million million (or 70,000,000,000,000,000,000,000) stars in the known Universe, which means these are just the ones that we can see with our telescopes.  This is supposed to be 10 times the number of grains of sand on all the beaches and deserts in the world.
6130
probably some country in the sahara desert
15381
sand is made up of a chemical compound called Silica (SiO2).
1151663
Universe in not infinite. It is finite and constantly expanding. Yes there are more galaxies than no. of grains of sands in all beaches of the world. This universe is unimaginably huge!
497693
anyway, there will be only about a few millimetres of rain in the sahara. and if u want to know how people get rain they get it from the oasis.