What percent of the earth is sand?  Water?
347844
70% of the Earth's surface is covered with water, but that's considerably different than the Earth being 70% water.\n\nThe deepest part of the ocean is the bottom of the Marianas trench, at about 11 km deep.  There is another 6366 km of rock underneath the trench before you reach the center of the Earth.\n\nThat's less than 0.1 % of the depth of the Earth, rather less than the peel on an apple, even if the whole ocean was as deep as the Marianas trench.\n\nHow much of the Earth is sand is trickier to answer, depending on how you define sand.  At what point do sand grains get small enough to be called silt, or large enough to be called gravel?  And do you include sandstone?  In any case, it's going to be a fairly small proportion compared to the overall size of the Earth.  Sand is only going to found on the surface.  Deeper down it will be quickly melted down and reformed.
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.
454213
I have disagree with the first answer as 35% of the earth is Iron. And while Aluminum is more abundent on the surface, nearly 80% of the core is iron. So I have to go with Iron.
923291
That depends on what you mean by the "entire world".  Planet earth is pretty much 100% material.  Any planet, or collection of planets, is also 100% material.\n\nBut the sun is plasma, and composes most of the mass in the solar system.  So the solar system is closer to 99% plasma, 1% material.\n\nBut those pesky astronomers were having trouble with some equations - seems like there was lots more stuff out there than plasma and material, but they couldn't find it.  Until recently.  They discovered load of new stuff, call "dark energy" and "dark matter" (since you can't see it from here, it must be 'dark', right?)\n\nTurns out most of the mass of the universe is dark energy and dark matter (about 95%), with the remaining little bit of plasma and regular matter.
59626
The bigger problem is useable water.  Only 1% of earth's water can be used by humans.  The rest is salt water or glaciation.  Here's a good website explaining more:\n\nhttp://ga.water.usgs.gov/edu/earthwherewater.html
83780
pre-cambrian: 88%\n\npaleozoic: 7%\n\nMesozoic: 4%\n\nCenozoic: 1%
664993
75% of the earth...u do the rest of the calculation.
303122
"Sandy Loam Soil"  is almost pure sand! anything else you might like to know would be listed under "soil science" enjoy!!!
858885
Blue.  The sea is 70% of the world's surface.
620149
"Rain plays a major role in the hydrologic cycle in which moisture from the oceans evaporates, condenses into clouds, precipitates back to earth, and eventually returns to the ocean via streams and rivers to repeat the cycle again. There is also a small amount of water vapor that respires from plants and evaporates to join other water molecules in condensing into clouds"\n\n" 90% of atmospheric water comes from evaporation, while the remaining 10% is from transpiration."\n\n The total amount, or mass, of water in the water cycle remains essentially constant, as does the amount of water in each reservoir of the water cycle. This means that rate of water added to one reservoir must equal, on average over time, the rate of water leaving the same reservoir.\n\nThe adjacent table (at the site below) contains the amount of water that falls as precipitation or rises as evaporation, for both the land and oceans. The runoff and groundwater discharge from the land to the oceans is also included. From the law of the conservation of mass, whatever water moves into a reservoir, on average, the same volume must leave. For example, 107 thousand cubic km (107 × 10³ km³) of water falls on land each year as precipitation. This is equal to the sum of the evaporation (71 × 10³ km³/year) and runoff (36 × 10³ km³/year) of water from the land."
1129982
Just a guess, but, maybe a tenth of a centimeter? The Earth is constatly being bombarded by ice crystals from space, that increase our water volume on Earth. So, we might NEED to remove all the sponges from the  Deep, in another million years or so.
123869
How many grains of sand are there on a beach?\n\nSomething like that.
1116721
Although the terms "ocean" and "sea" are often used interchangeably, a sea is generally considered to be smaller than an ocean. One definition of "ocean" is: a great body of interconnecting salt water that covers 71 percent of the Earth's surface. There are four major oceans—Arctic, Atlantic, Indian, and Pacific. However, some sources do not include the Arctic Ocean, calling it a marginal sea. The term "sea" is often assigned to saltwater areas on the margins of oceans, such as the Mediterranean Sea situated beside the Atlantic Ocean.
418513
0.38 that of earth's\n\nhttp://www.amnh.org/rose/mars/pl2.html
100786
Surface Area: Land area, about 148,300,000 sq km, or about 30% of total surface area; water area, about 361,800,000 sq km, or about 70% of total surface area.
171299
Africa is the world's second-largest and second most populous continent, after Asia. At about 30,370,000 km² (11,730,000 sq mi) including its adjacent islands, it covers 5.9% of the Earth's total surface area, and 20.3% of the total land area. With over 840,000,000 people (as of 2005) in 61 territories, it accounts for more than 12% of the world's human population.
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