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The Inca Empire was a vast empire that flourished in the Andean region of South America from the early 15th century A.D. up until its conquest by the Spanish in the 1530s. Even after the conquest, Inca leaders continued to resist the Spaniards up until 1572, when its last city, Vilcabamba, was captured.

The Incas built their empire, called Tawantinsuyu or the "Land of the Four Corners," without the wheel, powerful draft animals, iron working, currency or even what we would consider to be a writing system. The empire stretched from modern-day Argentina to southern Columbia, and was divided up into four “suyu,” which intersected at the capital, Cuzco. These suyu in turn were divided into provinces. [Gallery: Tracing the Ancient Incan Empire]

Machu Picchu sits nestled between the Andes mountains of modern-day Peru and the Amazon basin and is one of the Inca's most famous surviving archeological sites.

This breathtaking ancient city, made up of around 200 structures built up on the mountains, is still largely mysterious. Archeologists don't know what purpose many of the structures served, but its intricate roads, trail systems, irrigation canals and agricultural areas suggest humans used the site for a long time, according to UNESCO.

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question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals