Quais foram os principais aspectos que contribuíram para o declínio do sistema socialista no leste europeu ?

The main reasons for the 'falling' of the socialistic countries in Europe in about the same time was both, the similar circumstances, and a chain reaction. All of the socialist countries were in dire economic state, they were in big debt, bad economic planing, poverty, growing nationalism. All of these contributed that those countries fall apart, and when the process started with the first country getting out of it, the rest followed, and the central government couldn't control and stop the process.

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!