As water evaporates from where it collects — from lakes, rivers, and so forth — it rises into the atmosphere where it expands and cools. Some of that water vapor condenses onto dust particles, forming tiny droplets. A cloud develops as billions of those droplets come together. Different types of clouds are associated with the weather. Cumulus clouds are known as fair-weather clouds — the puffy white kind. But when cumulus clouds develop into cumulonimbus clouds, those clouds can bring hail, thunderstorms, and even tornadoes. Stratus clouds are flat and thin; you can usually see the Sun through them. Cirrus clouds are made mostly out of ice crystals, seen high in the atmosphere, and almost never bring rain.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.