Diatoms are also called as ‘pearls of ocean’, why? What is diatomaceous earth? Eduinfy.com
NCERT Solution: Biological Classification
Diatoms are also called as ‘pearls of ocean’, why? What is diatomaceous earth?

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Diatoms are the chief producers in marine environment. Hence, they are also called the ‘pearls of ocean’.
As walls of diatoms are made of silica, they have left behind a large amount of cell deposits in their habitat.
This accumulation is called diatomaceous earth.
Diatomaceous earth is gritty in nature and hence is used for polishing and, in filtration of oils and syrups.  
 

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