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How were the Incas able to carve and place the stones with their limited tools in Machu Picchu? ?

It’s for a power point at school. All who answer will have there question show to about 50 people. The kids will vote on their favorite answer. Their vote is based on good solid info, not funny stuff. If it is your answer they pick, you get 10 points! Please put a good, backed up answer with a web link to the source(s) of your answer. Thanks!

I am peruvian and as far as the history tells, the Incas move each peace of rock putting robes around them and being pulled by gangs of men, they also use ramps to take the stones up and down the hill, and some stones where carried through the stream of their main river (Urubamba)
The hills were worked by hand, in a shape of stairs what is called “andenes” and because of that the mountain chain that goes along Peru is called The Andes. The Incas were very good in agriculture.
They have a high knowledge of agriculture; the point in making the “andenes” was to use wisely the water to irrigate them.
They built channels alongside all the andenes and then let the water run through this channels that irrigated all the slop of the mountains.
About the buildings that seem like big bricks, they had a way of mixing straw, mud and water to form blocks that can be put one over the other. This method is now known in the highlands of Peru as “ladrillo de adobe” (adobe brick).

In the following website you will find more interesting information about the building sites of Peru and how the Incas manages to pull big stones.

http://www.pbs.org/wgbh/nova/transcripts/2404inca.html

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