I fall from the sky but I'm not rain. I am beautiful to look at but each of me is different. What am I?

These beautiful ice crystals perfectly fit the description, as they certainly fall from the sky. Their journey begins high in the atmosphere when an extremely cold water droplet freezes onto a tiny particle, like dust or pollen, creating an ice crystal. As this crystal falls, it gathers more water vapor, which freezes onto its surface, causing it to grow and develop. This process can take anywhere from a few minutes to several hours, with the snowflake encountering varying atmospheric conditions on its descent.

Each snowflake is a marvel to behold, with intricate patterns and a delicate, often star-like, appearance. The hexagonal structure is a fundamental characteristic, stemming from the way water molecules arrange themselves when they freeze. However, the precise shape and complexity of a snowflake are constantly influenced by the temperature and humidity it experiences during its fall. Even slight changes in these conditions can alter how the crystal grows, leading to an endless variety of designs.

Because every snowflake follows a slightly different path through the atmosphere, encountering unique combinations of temperature and humidity, no two snowflakes are ever exactly alike. From simple plates and columns to elaborate stellar dendrites, the diversity of snowflake forms is truly astounding. It is this unique "life story" for each crystal that makes them individually beautiful and perfectly answers the riddle.