An example of a seashell is the Cowry in which i will use.  I need to understand the shells formation from sand by evolution of other factors leading to the creation of a seashell.
206594
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.
660986
maybe this can help\n\nhttp://en.wikipedia.org/wiki/Fossils
512015
possible a model using different coloured sand in a glass jar/container?
252487
Different scenarios for different environments.  Sand is a habitat for many marine animals.\n\nIn the case of sand dunes along the coast- they are natural structures which protect the coastal environment by absorbing energy from wind, tide and wave action.
526571
I think that (1) would be crystalline structures, (2) is igneous (3) Certain schists have been derived from fine-grained igneous rocks such as basalts and tuffs.
22709
Igneous rocks are formed with heat. They are most commonly found around volcanoes. Metamorphic rocks are formed with heat and pressure. Sedimentary rocks, like sandstone and limestone, are formed by pressure.
425348
Ahhhh this is a fun one, and I just happened to know where you can get this info LOL  Please don't ask why, let's just say my bivalves were experiencing issues:
310934
Most sand is composed of silicon dioxide (quartz) which is very resistant to acids and abrasion, and that is also the reason beaches have sand. Whether the erosional force is air or water, most other materials are more easily removed, leaving behind the sand. Often this process took place in the ocean, then plate tectonics (the same force that built the mountains you mentioned) or sea level fluctuations leave the sea bed exposed to become a desert. So yes, many deserts were once part of a seabed, and often marine fossils can be found in outcrops of desert bedrock.
417261
Classification \nClastic \nBiogenic \nPrecipitate \n\nread and learn --> http://en.wikipedia.org/wiki/Sedimentary_rock#Classification
89549
The main ingredient in eggshells is calcium carbonate (the same brittle white stuff that chalk, limestone, cave stalactites, sea shells, coral, and pearls are made of). The shell itself is about 95% CaCO3 (which is also the main ingredient in sea shells). The remaining 5% includes calcium phosphate and magnesium carbonate and soluble and insoluble proteins
519703
sand - since you see it on the beach it can't be soluble\nwashing soda - yes\nbaking soda - yes
386568
Birth of Venus ...... girl in a shell\n\nhttp://www.logoi.com/pastimages/img/venus_1.jpg \n\nChild watching birth of new man ..... Eggshell\n\nhttp://dali.urvas.lt/page18.html\n\nGalas Object ............. shell of a spidercrab\n\nhttp://www.dali-gallery.com/html/galleries/object03.htm\n\nShell\n\nhttp://www.dali-gallery.com/html/galleries/painting07.htm
303056
I have to admit im not too clued up on the geology of Maryland, however over here in the UK we have in the Mendip Hills something which resembles Obsidian but in fact its not. On a university field trip we went to an old smelt, where the guys used to smelt Limestone and the result was this black shiny stuff that looked identical to Obsidian. The stuff was strewn all over the place in big heaps. Confused the 'ell out of us students initially until we were told the what it actually was. I wish I could remember more about it but then again uni was a bit of a blur!
242012
The only food value of sea shells is the mineral Calicum. It has so many sources and is of little value because it is so readily available throughout the world.
101948
OMGGG!! I can go on forever on this one... but I'll try to be as brief as possible. \n\nOk, so rocks are made by three different processes: \n\n- Volcanic eruptions - These rocks are called IGNEOUS ROCKS.  There are various types of rocks that can be produced.  They can be from either when lava flows on the surface of the earth and cools down, or when magma inside a volcano cools down before it hits the surface.  It doesn't take all that long for these types of rocks to form, and hese rocks are usually crystallized and can be easily distinguished because of the crystal type of formation.\n\n- Another tyoe of rocks - called SEDIMENTARY ROCKS are a result of erosion by wind, water, or glaciers.  These types of rocks may take thousands or even millions of years to form.  So, in this process, sediment (the tiny particles) that is eroded away from the different erosion processes settle in one place and over a long period of time they are formed into rocks. One layeer after the next. \n\n- And the last types of rocks are formed from either Igneous rocks or Sedimentary rocks.  These are called METAMORPHIC ROCKS... word derived because thise rocks have "morphed" into something that is no longer sedimentary or igneous rocks.  These rocks go through these changes and become Metamorphic due to the high pressure which causes heat to build up in these solids.  These rocks can also be relatively easily distinguished because when you look at them, you can actually see flat grains.\n\nso, no! Rocks do not magically appear but they appear over time.  \n\nThere is tons more to the subject, as in you can actually study a given rock and tell how old it actually is and when it was originally formed, but that's another question! :)\n\nhope this helped... \nCheers!
270784
try wikipedia, search fossils
277895
Here are some really basic notes, i don't know what grade you are in, i'm is 6th\n\nFirst, a fossil is made by:\n\n1.  the animal dies and lays on usually sand and mud\n2.  any living objects have calcium\n3.  later, the skins and other parts are rotted and faded away.  \n4.  only the solid, bone, is left\n5.  new sediment covers it\n6.  then the water or whatever goes down into the sediment.  \n7.  the minerals of the water then fills in any gaps and hardens\n8.  the bone or solid will then be replaced by the minerals that are harden\n9.  a replica of the bone is made\n\nremember that a fossil is not a bone\n\na fossil is a replica, copy, of a bone\n\na fossil is a rock\n\narchaeolgist then puts the fossils together to get a view of the organism that has onced lived.\n\nmany things count on fossils, like what type of animals lived.  or even how migrators moved.  footprints are also can be a type of fossil...\nwww.diamondgemztone.piczo.com\n<>dia gemz\nsheri