* Snow: This is the most common answer. Snow is frozen water that falls from the sky in the form of flakes.
* Hail: This is another form of frozen precipitation, but it's more solid and often comes in larger chunks.
* Cottonwood fluff: In springtime, cottonwood trees release fluffy white seeds that can drift on the wind and appear to fall from the sky.
* Foam: Sometimes, strong winds can pick up foam from lakes or oceans and carry it inland, where it can fall like snow.
* Pollens: During allergy season, certain types of pollen can be so plentiful that they appear like white flakes falling from the sky.
* Other substances: There are other less common possibilities, like volcanic ash, industrial emissions, or even tiny pieces of plastic.
To figure out what it is, consider these factors:
* Season: Snow is most likely in winter, while cottonwood fluff is common in spring.
* Location: Are you near a lake or ocean? Do cottonwood trees grow in your area?
* Texture: Is it soft and fluffy like snow, or harder and more solid like hail?
If you're unsure, it's always best to err on the side of caution and avoid touching any strange white stuff you find falling from the sky.
