* Clouds are constantly changing: They form, grow, move, and dissipate all the time.
* Clouds are spread out over the entire Earth: We can't see all the clouds at once.
* Clouds come in many sizes: From small, wispy cirrus clouds to massive cumulonimbus storm clouds.
Instead of counting clouds, we focus on types of clouds (like cumulus, stratus, and cirrus) and cloud cover (how much of the sky is covered by clouds).
