diatomite
diatomite Diatom-rich sediment, which has been laid down in a lacustrine or deep-sea environment. The diatom cell wall is made from silica, therefore the sediment is siliceous. See BACILLARIOPHYCEAE; DIATOMACEOUS EARTH; and RADIOLARIAN EARTH.
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terrestrial planet
terrestrial planet, the earth or a planet that resembles the earth in its physical characteristics. The terre… Earth , Imagine that you are describing planet Earth to someone who has never seen it. How would you describe its appearance? What would you say about it? Wh… Diatoms , Diatoms
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diatomite