A mushroom cloud was observed over the Russian city of Kazan

🇷🇺 A “mushroom cloud“ was observed over the Russian city of Kazan This type of cloud is called a cumulonimbus. They form when their upper part reaches the stratosphere, at an altitude of 12 km above the earth. The cloud has no more room to rise and begins to expand horizontally Subscribe to [club80289214|@SputnikInt] Источник: Sputnik International