Ответ:

1) Gagarin was the first man who flew round the planet in a spaceship.

2) The formation of ores is very thick here. A plant can be built nearby. 3) The stagnation of industry means that plants stop working. 4) But all the problems can be solved. 5) Elbrus is the highest mountain in Europe. 6) These mountains are the result of tectonic activity. 7) Irkutsk is a city in Eastern Siberia.