The centipede with the greatest number of legs is Himantarum gabrielis of southern Europe, which has 171 to 177 pairs of legs when adult. Platinum, which is in fact more precious than gold, was originally considered worthless. Spanish conquistadors found it in South America, and at first thought it was silver. However, when they tried to work it, they found that none of their current refining or smelting techniques could make the platinum usable at all. Amend, Discuss, Correct Diamond is the hardest naturally occurring substance, and is also one of the most valuable natural substances.
Diamonds are crystals formed almost entirely of carbon.
Because of its hardness, the diamond is the most enduring of all gemstones. They are among the most costly jewels in the world, partly because they are rare, Only four important diamond fields have been found - in Africa, South America, India, and the Soviet Union. Amend, Discuss, Correct Between A.D. 1400 and 1520 the Inca emperors of South America built more than 15,000 miles of roads from sea level to high into the Andes Mountains. If you dug a hole directly through the center of the earth starting anywhere in the U.S., you would not wind up in China. You wouldn't even wind up on dry land, but somewhere in the Indian Ocean.