Formation and Nature of Pearl: Pearl is secreted by the mantle of the pearl oyster as a protection against foreign objects which may be sand particles, minute larval forms or other such things. To study the mode of formation of pearl it is essential to know the structure of the shell and mantle.
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Activated carbon, also known as activated charcoal, is a crude form of graphite, the substance used for pencil leads. It differs from graphite by having a random, imperfect structure which is highly porous over a broad range of pore sizes from visible cracks and crevices to molecular dimensions.ctivated carbon (activated charcoal) has the strongest physical adsorption forces, or the highest volume of adsorbing porosity, of any material known to mankind. Activated carbon (activated charcoal) can have a surface of greater than 1000mÂ²/g.