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en.wikipedia.org/wiki/Seashell

A seashell or sea shell, also known simply as a shell, is a hard, protective outer layer created by an animal that lives in the sea. The shell is part of the body of the animal. Empty seashells are often found washed up on beaches by beachcombers.

www.scientificamerican.com/article/how-are-seashells-created

How are seashells created? Or any other shell, such as a snail's or a turtle's? ... of how shell forms is that the protein matrix of bone and seashell is secreted out of the cells. ... like humans ...

sciencing.com/how-seashells-formed-4923554.html

A seashell is made mostly of calcium, with no more than 2 percent of protein. It forms from the bottom up, creating three clear layers an uncalcified outer proteinaceous periosteum (similar to human fingernails), a calcified prismatic layer and an inner pearly calcified layer of nacre.

www.diyncrafts.com/18615/repurpose/20-seashell-projects

This one is all shells, and put together, they make a stunning statement piece for your entry door or anywhere in the house you want to hang it. You can form these around a wreath form, and use a collection of sizes and colors if you want, or make them completely uniform to make the wreath a bit more elegant. Tutorial and Source: marthastewart

answers.yahoo.com/question/index?qid=20071113090415AAqn3Ps

Best Answer: First of all, sand and most crustaceans don't make shells that become sea shells. Sea shells are mostly made by molluscs, which include animals like clams, oysters, and snails. Other types of marine animals that make shells are echinoderms, such as sand dollars and sea urchins.

science.howstuffworks.com/question556

The seashell that you are holding just slightly above your ear captures this noise, which resonates inside the shell. The size and shape of the shell therefore has some effect on the sound you hear. Different shells sound different because different shells accentuate different frequencies. You don't even need the seashell to hear the noise.

www.annsentitledlife.com/crafts/how-to-make-a-seashell-mirror

How To Make A Seashell Mirror Materials . This is everything I purchased and/or used to make this seashell mirror: • US Shell, 36 Piece, White Scallop Sea Shells, 4 to 5 Centimeters in Size – Clam shells formed the bottom base. I ordered one pack, and my frame is 24″ x 28″.

www.marthastewart.com/275561/shell-crafts

Kids headed back to school can savor a piece of summer by latching one of these DIY seashell key chains onto their backpacks. (They're fun for grownups too: make one for yourself and hang it on your tote bag.)

www.iloveshelling.com/.../16/what...many-different-holes-in-seashells

What Makes The Different Holes In Seashells? Posted by pam | May 16, 2014 ... You have answered yet another of my “seashell” questions I have wondered about while combing the Sanibel and Ft. Myers beaches. I was thinking the holes were like you said, wear and tear. Now I know! And I love the gift tag idea. Duh!

mentalfloss.com/article/65136/8-fascinating-facts-about-seashells

8 Fascinating Facts About Seashells. BY Erin McCarthy. July 22, 2015. Bloomsbury. When wandering the beaches this summer, have more to say about the shells you find than why you can hear the ocean ...