Question

Where oceans once existed on the Earth, geological layers of ocean deposits are all that are left. What is "diatomaceous earth" and what abrasive white powder makes up 90% of its composition?

Answer 1

I really need help on this question. I have no idea what it is asking about.

Answer 2

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Answer 3

While science fiction authors might suggest that fossils are best used to clone dinosaurs, diatomaceous earth shows us that fossils have a great number of uses in day to day living. Diatoms are tiny, single-celled algae found in plankton. Diatomaceous earth is a fine, white, crystalline powder made up of the fossilized shells of diatoms. Lightweight, gritty, and porous, it finds a surprising array of uses.

Answer 4

No, it is not the fossilized shells. It is just the shells, which are basically glass. You can imagine why this is so abrasive.

Answer 5

so it is the shells but not fossilized shells?

Answer 6

The typical chemical composition of oven-dried diatomaceous earth is 80 to 90% silica, with 2 to 4% alumina (attributed mostly to clay minerals) and 0.5 to 2% iron oxide.

Answer 7

thank you very much!!!!!!!!!

Answer 8

may i get a medal plz

Answer 9

@arwen0222 Yes, the shells, frequently highly compressed, but they are not fossils.