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Diatoms are also called as 'pearls of oc...

Diatoms are also called as 'pearls of ocean' why ? What is diatomaceous earth ?

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Diatoms are also called pearls of ocean due to:
(i) They are siliceous, thus deposit silica in ocean after their death. (ii) They are autotrophic and major producers in ocean.
(iii) Diatomaceous earth with deposits of silica is chemically inert, porous, absorbent and fireproof.
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