Composition
Most (95-97%) of the catacombs are former sandstone multilevel mines, from which stone was extracted to construct the city above. The remaining catacombs (3-5%) are either natural cavities, or were excavated for other purposes such as sewerage. As of 2012, there are more than 1000 known entrances to the tunnels.
Read more about this topic: Odessa Catacombs
Famous quotes containing the word composition:
“The naive notion that a mother naturally acquires the complex skills of childrearing simply because she has given birth now seems as absurd to me as enrolling in a nine-month class in composition and imagining that at the end of the course you are now prepared to begin writing War and Peace.”
—Mary Kay Blakely (20th century)
“I live in the angle of a leaden wall, into whose composition was poured a little alloy of bell-metal. Often, in the repose of my mid-day, there reaches my ears a confused tintinnabulum from without. It is the noise of my contemporaries.”
—Henry David Thoreau (1817–1862)
“Every thing in his composition was little; and he had all the weaknesses of a little mind, without any of the virtues, or even the vices, of a great one.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)