Shell

Are shells a mineral?

Shells are made of calcium carbonate, in the mineral form of calcite or aragonite. Animals build their shells by extracting the necessary ingredients—dissolved calcium and bicarbonate—from their environment. Shells come in many shapes and sizes, from giant clams more than a metre wide, to tiny shells that can barely be seen with a microscope. A …

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What shell is sh?

The sh is a popular term and shortcut used to describe the Bourne shell in Linux. Bourne shell is a very simple shell that is provided with most of the Linux distributions. Sh (or the Shell Command Language ) is a programming language described by the POSIX standard. It has many implementations ( ksh88, Dash, …

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Why do shells sound?

Shells sound like the ocean because the curved shape of a seashell amplifies the ambient noise, or background noise, that normally is too quiet to be heard. This occurs because air bounces within the shell and makes sound, which varies in pitch depending on the size of the shell. You can find conch shells turned …

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