Good Morning to you on a raining Friday here in S Illinois. My granddaughter said she read the post about eggs and asked if I put the answer some where, so I thought It only fair to post one. My simple answer is that when the egg is laid, it is of a rubbery (tough) consistancy making passage into the world easy, so when it hits the ground it won't break. Then it hardens rather quickly. If you want to read more about the formation of it, you can check this article...
http://www.blurtit.com/q240100.html It's a very interesting article. I didn't know it took so long to make the egg. I even learned something new. Boy, I love the internet. I just googled "how eggs are made" and lots of stuff came up. You'll never look at an egg the same way after reading the article. lol
Above is a block from a swap hosted by Sindy Rodenmayer. Check out her Great sight. http://www.fatcatpatterns.com/
Have a Wonderful Day! Kathy