I would say about a million years. When I was younger, my family did an experiment, trying to see how long it took an egg shell to break down. It still hasn't to this very day. I was about nine, and am now 59, so I wouldn't give it another thought. Hope this information helps.
The answer depends on where the eggshell is placed. The existence of fossil dinosaur eggs shows they can last a long time. However, if the eggshell is added to a typical compost pile it will decompose as soil bacteria feed on it. (see http://www.paleo.ku.edu/palaios/25/5/smith.pdf)
However, if the eggshell is left on a shelf in your house then it could be there well past 50 years.
An Egg (inside) is mostly "Protein" Egg Shell is mostly "Calcium Carbonate". Proteins dissolve in Alkaline Chemicals like Bleach. Calcium Carbonate will dissolve in vinegar in about a week, it doesn't take very long. There will be red floating in the vinegar, it's the dissolved shell. But the egg itself remains undissolved, although the texture of the yoke is different.
Yes, the nutrients in the shell benefits the soil.
The earth's crust is like an egg because the eath has a mantle (sort of like a shell) and an egg has a shell as well. Try this get a cup get an egg pour vineger and or salt in to the cup then drop the egg in the cup. Wait 2 or 3 days and after those 3 days the egg will feel soft.
tectonic plates fit together like a jigsaw puzzle that makes up the surface of earth. you could compare the lithosphere to the cracked shell of hard - boiled egg. the shell may be broken into many pieces but it still forms a crust around the egg itself.
the egg will sink and the water will ''float''
yes egg shells can disintegrate in vinegar.
you boil the egg in water and them peal the hard shell after about 10 minutes of boiling
It can take up to twenty one days for a chick to hatch out of the egg. In incubation, it may take up to 24 hours for a chick to hatch out of the egg.
the shell of an egg
This is an egg that can be in a shell and out of a shell.
the shell of an egg
It takes 3 weeks then the head will pop out and it will begin eating its own egg shell.
Actualy the answer is no beacuase if you slowly take apart a shell it'll have plastic see through white stuff and that's the stuff that holds the egg
A leathery shell is a shell that is flexible rather than solid like the shell of a bird egg. A snake's egg has a shell that is flexible, as does a turtle's egg.