Explain the formation of seashells from sand.?
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Hmm. I don't think seashells are formed from sands. Seashells are marine creatures to be exact, marine snails. Though I have yet been able to verify, I believe the reproduction process of seashells are similar to that of a snail. That is some seashells are hermaphrodites, producing both spermatozoa and ova, others are either male or female. They inseminate each other to internally fertilize the ova, thus producing fertilized eggs.
1107933
sand, it can be pretty gross if the beach is not cleaned up
153159
Seashells are formed by layers of calcium carbonate, covered by a thin organic surface layer, the periostracum.\n\nCalcium carbonate may occur as two different minerals: calcite and aragonite. Calcite is more stable, but aragonite is harder than calcite. Calcite is the main shell component in oysters; whereas aragonite is more important in freshwater and land snails. Many marine molluscs have alternate layers of both minerals. \n\nThe periostracum is formed by a type of conchin (quinone-tanned proteins, somewhat similar to insect exoskeleton). Conchin may also be incorporated in the mineralized layers.
1185112
Here is the boring wikipedia answer, there is another specific answer for California beach sand at the end:\n\nSand is an example of a class of materials called granular matter. Sand is a naturally occurring, finely divided rock, comprising particles or granules ranging in size from 0.0625 (or 1/16) to 2 millimeters. An individual particle in this range size is termed a sand grain. The next smaller size class in geology is silt: particles below 0.0625 mm down to 0.004 mm in size. The next larger size class above sand is gravel, with particles ranging from 2 mm up to 64 mm (see grain size for standards in use). Sand feels gritty when rubbed between your fingers (silt feels like flour).\n\n\nThe most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide), usually in the form of quartz which because of its chemical inertness and considerable hardness is quite resistant to weathering. However, the composition of sand varies according to local rock sources and conditions. The bright white sands found in tropical and subtropical coastal settings are ground-up limestone. Arkose is a sand or sandstone with considerable feldspar content which is derived from the weathering and erosion of a usually nearby granite. Some locations have sands that contain magnetite, chlorite, glauconite, or gypsum. Sands rich in magnetite are dark to black in color, as are sands derived from volcanic basalts. The chlorite-glauconite bearing sands are typically green in color, as are sands derived from basalts (lavas) with a high olivine content. The gypsum sand dunes of the White Sands National Monument in New Mexico are famous for their bright, white color. Sand deposits in some areas contain garnets and other resistant minerals, including some small gemstones.\n\nHere's another specific answer for California:\n\nBeaches vary in color according to the mineral content of the sand, which is also a clue to the origin to the eroded sediments that make up the sand supply. eroded shale cliffs create the charcoal gray beach sand at Shelter Cove in Humboldt County. North of Humboldt Bay, the coarse sands of Agate Beach are multicolored agates that have been ground and polished by the surf. Ground quartz and feldspar mineral make up the white beaches of Carmel, while a few miles to the north in Sand City, amber colored sand indicates the presence of iron mineral. Close inspection reveals that white sand beaches are mosaic of pale quartz grains, pink green or white feldspar and fleck o black mica.
1115641
If it hits sand, it will often make glass.  It makes the ground very hot for a short time, having so much moisture around it draws the heat away quickly.
182207
My 9yo daughter and I collect the state quarters. \n\nWe don't actually "collect" shells or sea glass officially but whenever we go to the beach we look for good shells and especially sea glass which is nearly impossible to find. She does have a fews pieces of sea glass and we were inspired to find & keep them when we saw the sea glass jewelry in the shops down the shore. I said 'if we find sea glass we can make our own sea glass jewelry and maybe even sell them." we haven't made any jewelry as of yet but maybe we will someday.
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Clay = Dust + Water\nBlood clot = Embryo (beginning phases)\n\nedit: Everything was created out of nothing in the beginning. The dust and the water was also created from nothing.\n\nNothing-->Dust + Water-->Clay-->Man\n\n\n---\nthanks zifikos, you too! :-)
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Someone told me about this not so long ago...\n\nIts where the Sun reflects on the water or something for the sea\n\nand \n\nits green nearer the sand.. cus the sands yellow the seas blue so both colours mix together to make green\n\n(dont reli make sense)
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Sedimentary rocks can be divided into two major informal groups, referred to as clastics (or siliciclastics) and carbonates. Clastic rocks are formed by erosion of other rocks, igneous, metamorphic and sedimentary. These 'clasts' can be mud, silt, sand, cobbles, or boulders, and are transported by wind, water, or gravity and accumulate where they eventually are buried and pressure and temperature subject them to diagenesis, the process that makes them from unconsolidated clasts to one rock mass. Shale, sandstone, and conglomerate are examples of clastics.\n\nCarbonates can work much differently since they form primarily in the oceans. Many carbonates are made from reefs and other living organisms that grow in the ocean. As these organisms die and leave behind their carbonate skeletons, rocks are formed. Other carbonates are formed from small grains called ooids, small balls that form by precipitating out of sea water, possibly with the help of bacteria or algae. Some ocean algae even form carbonate 'mud' that eventually becomes hard rock. \n\nAnother unusual group of sedimentary rocks are called evaporites. These are rocks like gypsum and rock salt that are deposited by evaporation of water in confined basins. \n\nThe most fascinating part about sedimentary rocks is that they have a past, each one tells a story.
633202
It is made by heating sand.\nGo to wikipedia.org\nThen type in just glass in the search engine.\nhttp://en.wikipedia.org/wiki/Glass
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Pearls are created by certain molluscs most notably oysters as a result of irritation. As a response to an irritating object inside its shell, the mollusk will deposit layers of calcium carbonate (CaCO3) in the form of the minerals aragonite or calcite (both crystalline forms of calcium carbonate) held together by an organic horn-like compound called conchiolin. This combination of calcium carbonate and conchiolin is called nacre, or more commonly mother-of-pearl.
945581
Erosion is the displacement of solids (soil, mud, rock and other particles) by the agents of wind, water or ice, by downward or down-slope movement in response to gravity or by living organisms (in the case of bioerosion).\n\nDeposition, also known as sedimentation, is the geological process whereby material is added to a landform. This is the process by which wind, water or ice create a sediment deposit, through the laying down of granular material that has been eroded and transported from another geographical location.\n\nDeposition occurs when the forces responsible for sediment transportation are no longer sufficient to overcome the forces of particle weight and friction, which resist motion. Deposition can also refer to the build up of a sediment from organically derived matter or chemical processes. For example, chalk is made up partly of the microscopic calcium carbonate skeletons of marine plankton, the deposition of which has induced chemical processes (diagenesis) to deposit further calcium carbonate.
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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
1039073
Sand Dollars are most like sea urchins, or the little prickly balls that you find at the bottoms of oceans. When they are alive, they have small, tiny spines that surround the entire shell, making it feel like velvet. When you see them washed up and dead on the beach, you can't feel the velvety 'skin' and spines on their shell because of their exposure to the sun. Sand Dollars are also found at the bottoms of oceans, and in shallow salt waters they are found just beneath the surface of sandy or muddy areas. Sand Dollars aren't plants, they are marine animals. And no, they don't hold an animal inside, but they are still a treasure! :D In fact, they got their name 'sand dollar' because people used to think that they were mermaid money.\n\nHope this helps!
306238
Sand dunes like the ones in Colorado's San luis Valley are formed by winds and wind carrying particles have a scouring effect on the earth like a sand blaster. Wearing away at huge rock formations. Over the extremes of geological time this can make huge differences in the rock. Wind can carry small particles great distances as well and redeposit it. Much top soil is lost in this way. Any wind action such as depostion, erosion  or transportation is refered to as eolian in geological terms.
113727
Here is a very simple explanation of the two methods, there are a lot of fine details in each process that are not discussed here.\n\nIn sand casting, a mold of the object to be cast is made using sand that is compacted around the object. The mold is typically in two halves. After the impression is make, the object is removed, the two halves put together and the casting material is poured in. After setting up, the mold is taken apart and the casting removed. In the process, the impression in the sand is lost. To make another casting, the whole procedure is repeated.\n\nFor die casting, a metal mold is made in the reverse shape of the object to be cast. Again the mold is typically in two halves, the halves are joined and the casting material poured in. After cooling, the halves are taken apart and the casting removed. With this method, the mold is still intact so additional copies can be make. Only certain metals, like lead, can be die cast. This method is useful for material like plastics.
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This is a great way to begin understanding the different forces that shape the land.  It is important to remember how the rocks came to be found, Metamorphic rocks from Michigan that may have been dug up from a deep quarry or found on the surface exposed by glacial action.  In N Carolina they could be sedimentary rocks exposed by water erosion.  In Florida they could very likely be calcium carbonate deposited by ancient coral reefs.  A simple understanding of these and other rock forming processes would make a prize winning 4th grade report.  Good Luck!