Diatoms pile up at the bottom of water reservoirs and form big heaps as -
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Diatoms have cell walls composed of two thin overlapping shells that fit together like a soapbox. These walls are impregnated with silica (transparent, opaline silica), which makes them indestructible and resistant to decay. When diatoms die, their siliceous cell walls (frustules) do not decompose, but rather pile up at the bottom of water reservoirs (oceans and lakes), accumulating over millions of years to form massive deposits known as diatomaceous earth or diatomite.
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