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Read the following text, excerpted from "Egypt's Master Builders," by Noreen Doyle. Then, write three to five sentences summarizing the main ideas of the excerpt.
Egypt is rich in many kinds of stone suitable for building. Limestone and sandstone were quarried from the hills using picks made of stone that was denser than the limestone or sandstone. When builders needed to break apart a hard stone such as granite, they had workers use balls of dolerite, a very dense rock. Quarrying was extremely difficult work and usually assigned to prisoners of war or convicted criminals. Sometimes, big levers, made from beams of wood, were used to pry a block free. A single huge blockof stone is called a monolith. Monolithic obelisks and colossal statues could weigh more than 1,000 tons each. To move stone blocks, the Egyptians built roadways and ramps near quarries and building sites. They placed the stone on sledges with wooden runners and poured water in front of the sledge to make the roadway muddy and slippery. Hundreds of men might be needed to haul the heaviest loads. Logs were also used as rollers on which to slide the blocks. Boats made it easier to transport building materials over long distances.