сочинение про мой класс

WITH their metal tools,bronze age people could do many more things.in particular,they could cut rocks to build houses,palaces,temples and huge monuments,like the pyramids.however,there was a problem.although copper was quite common,tin was not,so bronze was always expensiv. then,around 1500bc people discovered a new metal- iron.iron is very common metal.almost 5% of the earth's crust is iron and scientists believe that the red colour of the planet mars is iron,too.with the iron age,tools and weapons became a lot cheaper.

помощь..(