Summary
Clouds are not only water droplets; they can carry bacteria and fungal spores. Some even act as ice nuclei, influencing how precipitation forms.
A white cloud can look sterile from afar. But the atmosphere is also a conveyor belt for life.
Winds can lift microbes from soil and sea into the air. Inside cloud droplets, they can travel long distances.
Some organisms provide surfaces that help ice crystals form. That can create subtle but meaningful effects in cloud physics.
It shows the sky is not only weather, but a moving extension of the biosphere. Even rain can carry traces of life in its journey.
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