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They built it with sandstone.
granite
Sandstone , sedimentary rock
It took about 2,000 years to build the Great Wall of China. That would be at least 730,484 days.
Most sandstone houses were built with a lime mix. The lime allowed the walls to move without cracking.
It would obviously take 20 hours as there are half the men! ... do the math! nope wrong ^^ The wall is already there (it is the same wall) so they would need no time at all *lol* ^-^
Because he want to defence his country________________________________________________________________________He had to build the great wall in order to protect the northern borders of his country from the invasions of his country's enemies.
20 hours
Sandstone and other rocks that were found in the region.
Depends on what kind of wall you plan to build. If it is a brick wall, then you would probably need cement, bricks, shovel, trowel, and measuring tape. The amount of bricks will depend on how long and wide the wall will be. Hope this helps.
to prevent land from erosion and flooding
They build the Great wall in the 3rd century BC.