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The famous White cliffs of Dover gain their white color from a well-known compound: chalk. CaCO3. Absolute mountains of the stuff. Mountains that were formed by billions of years of tiny life forms with tiny little limestone shells dying and falling to the bottom of the oceans. The White cliffs of Dover are one example of this, but by far not the only one. There are chalk deposits all around the world. One microorganism, and then more microorganisms one at a time over millions of years microscopically living and dying and becoming mountains. This helps illustrate the impossible nature of geological time-frames.