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.
Carbonite is a cloud-based solution optimized for individuals and small businesses seeking secure offsite system backups, which will protect them in the case of a disaster. Large corporations can pretty much afford private cloud systems for backup and subsequent disaster recovery efforts.
Carbon has two  naturally occurring pure forms (allotropes), which are graphite and  diamond.  Graphite is a silver  grey powder which consists of planes of carbon atoms a â¦ rranged in  interlocking hexagons. There are two kinds of bonds within the  sheets, covalent and delocalised.harcoal-a form of non-crystalline carbon   Graphite-crystalline carbon-known as 'pencil llead' (although there is no lead in it!). In graphit, the atoms are joined t â¦ ogether in flat sheets.   Diamond-crystalline carbon with the carbon atoms arranged differently from graphite-in a huge 3d matrix.