Occurrence in Nature
Iron(II) oxide makes up approximately 9% of the Earth's mantle. Within the mantle, it may be electrically conductive, which is a possible explanation for perturbations in Earth's rotation not accounted for by accepted models of the mantle's properties.
Read more about this topic: Iron(II) Oxide
Famous quotes containing the words occurrence and/or nature:
“One is absolutely sickened, not by the crimes that the wicked have committed, but by the punishments that the good have inflicted; and a community is infinitely more brutalised by the habitual employment of punishment than it is by the occasional occurrence of crime.”
—Oscar Wilde (1854–1900)
“Three years she grew in sun and shower,
Then Nature said, ‘A lovelier flower
On earth was never sown;
This Child I to myself will take;”
—William Wordsworth (1770–1850)