Chalk Made Out from Seashells

2528 Words Feb 12th, 2013 11 Pages
Chapter I
INTRODUCTION

Nowadays, people are getting to use to collect seashells for fun and for past time. They made decorations, even accessories for a doll out of it and most people collect seashells. Here in the Philippines, people made seashells for decorations and accessories. They made seashells into accessories for them to sell it. But don’t you know that aside from those things seashells can also be made into a much useful things. In addition, seashells are also used in making jewelry. These shells are made into smooth perfect spheres which, by themselves, could be mistaken to pearls. We are aware that the education is the most powerful key to succeed. And to support this, we need some facilities and materials for us to make it
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The shells are the part of the body of a marine animal, in most cases the exoskeleton. The word shell is often used to refer only to the shells of marine mollusk, mollusk shells but it can also be used to mean the shells of a wide variety of marine animals from different phyla. The composition of seashells have three distinct substances involved: the outer layer of the horny substance conchiolin, the intermediate layer of calcite, and the smooth inner layer composed mainly of calcium calbornate. The blood of a mollusk is rich in a liquid form of calcium. A soft outer organ called the mantle concentrates the calcium in areas where it can separate out from the blood, forming calcium carbonate crystals. The mantle deposits sheets of the crystal in varying thickness. The individual crystals in each layer vary in shape and orientation. Most of the seashells are commonly found in beach drift, natural detritus that is deposited along strandlines on the beaches by the waves and the tides. Shells are very often washed up onto a beach empty and clean it’s because the animal has already died and the soft parts having rotted away or having eaten by either predators or scavengers. Empty seashells are often found by beachcombers and collecting these shells is a harmless hobby or study. The majority of seashells which are offered for sales commercially have been collected alive and then…