they have developed space expedition , medicine, and computer communications technology. :D (SCIENCE)
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Using synthetic materials, are less expensive for the suppliers to buy.
drawing materials r those through which we do drawing..........n we use it by ourself
The materials used to build skyscrapers are strong materials that can withstand a great tension and compression. Early days the skyscrapers are usually made by iron frame but now it uses lighter and stronger metal, steels.
some uses of earmuffs are to use them on a plane. another use is when you are in cold weather.
floods less land, uses less materials (concrete, steel...) to construct dam