Good day It is well-known fact that the volcanic eruptions cause the global decrease of average temperature. I quickly reviewed the article in wikipedia and several questions arised regarding this issue. There is written in this article (I do not trust Wikipedia very much): 1) So, the most dangerous/active factor that cools our planet is aerosols that are made of volcanic ash+ sulfuric acid, right? 2) What about the sizes of these aerosols? 3) What can you tell me about their exact chemical composition? 4) How are they distributed in stratosphere? Do they occupy the thickness of 10–50 km (these are lower and upper boundaries of stratosphere) equally? 5) After some amount of time (months, years) the effect of “Volcanic winter” weakens, apparently because of the weight of the volcanic aerosols. Do they (chemically) decay or do they sink down towards the Earth’s surface? 6) Are they subjected to the solar radiation? Can this radiation (if strong) evaporate/decay them?