Почему возникла необходимость принятия жеты жаргы​

Это деление пришло из археологии, в которой наиболее важный элемент материальной культуры - орудия труда. Каменным веком называют период, в котором орудия труда производили из отбитого камня, бронзовым - когда их отливали из бронзы, а железным - когда их изготавливали из железа или стали путём ковки.

Каменные орудия труда легко изготовить, но они неудобны и не позволяют достичь высокой производительности труда. Железные же сделать трудно, для этого нужно овладеть секретами выплавки и кузнечного дела, но они прочнее и эффективнее всех других.

Итак, схема:

Каменный век: орудия из отбитого камня

Бронзовый век: орудия из литой бронзы

Железный век: орудия из кованого железа или стали

I have just finished school number ...My school is (not) very new and modem and (but) it is very conformable and all the pupils like it very much, it is really home for everyone, who studies there. It has three (four, five, two) floors. The classrooms are light and high. There are classrooms for practically all the subjects - English, History, Physics, Mathematics, Chemistry, Geography, Literature, etc. There is a computer class in our school, -where pupils study computing, one of the most important subjects nowadays. There is a school hall in our school, too. Meetings, conferences, concerts and all the celebrations take place there 

Our school has a gymnasium and a sportsground. Many pupils are fond of sport and they have a good opportunity to go in for different sports there. 

I am very thankful to my school. When I was only seven years old, I entered it to get some knowledge and I know many things now thanks to my school and my teachers. The teachers in my school are very kind and clever, they give all their knowledge and all their love to the pupils. 

There is a good tradition in our school. Every year the school leavers come here to meet their teachers and classmates. Such meetings are very touching and interesting. 

I'll never forget my school, my favourite teachers and my classmates. It is my childhood and it is the happiest period in one's life, to my mind. My first friends, my first love and my first achievements and disappointments are all connected with my school life.