Sea Shells

Seashells are the hard outer skeletons of certain animals that live in the sea. These animals are called mollusks. Because mollusks have very soft bodies, they produce hard shells made of calcium carbonate to protect themselves. These shells act like homes, shielding them from harm. We often see seashells washed up on beaches by the waves.

How Are Seashells Formed?

Seashells form slowly from a substance called calcium carbonate, secreted by the living organism inside. As the animal grows, the shell grows with it. This is why shells often have ring-like lines on their surface; these lines indicate how long the shell has been growing. Some shells are long and pointed, while others are round and flat. The shape of a shell depends on the species of mollusk that produced it.

Where Are Seashells Found?

Seashells are the remains left behind by mollusks living in seas, oceans, and sometimes lakes. They are most commonly found along warm and temperate coastlines. Waves carry shells to shore, where we encounter them while walking along the beach. Fishermen also sometimes find shells caught in their nets. Since mollusks in different regions produce different types of shells, the shells found on each coastline vary in appearance.

Colors and Shapes of Seashells

Seashells come in a wide variety of colors and patterns. Some are white and plain, while others display vibrant hues such as red, brown, or orange. They may have stripes, spots, or wavy designs. Their shapes are also highly diverse:

• Some are long and spiral-shaped,

• Others are round and flat,

• And some resemble small box-like structures with lids.

The reason for this great diversity is that mollusks adapt their shells to suit different habitats. Colors and patterns sometimes help camouflage the shell, or provide protection from other animals.