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Various cloud formations might be one of the most beautiful and romantic sights in nature.

Still, these masses of liquid droplets is also a complex and scientifically interesting natural phenomenon. The interesting fact is that regardless of the shape and the looks of the cloud, they’re all made of the same thing – condensed water or ice.

When the sun heats the ground, warm air starts to evaporate and rise towards the sky. Once these water vapor particles cluster together, a cloud is formed. If it is being joined by more water crystals and keeps growing, it will eventually reach us on the ground as rain or snow. Otherwise, the clouds simply evaporate into thin air.

Even though all the beautiful cloud formations might seem random and indescribable to you, there’s a whole cloud classification system that’s uniform worldwide.

Luke Howard, British manufacturing chemist and an amateur meteorologist, was the first to introduce a nomenclature system for clouds back in 1802. Today clouds are categorized based on their shape, altitude, the process of formation, and other features.