Discussion
Which particles act as ice nuclei in the atmosphere?
Answer: A
Mineral dust, particularly clay minerals, and biological particles such as certain bacteria and pollen are the most effective ice nuclei, and they are far scarcer than the nuclei on which droplets form. Sea salt and sulphate are excellent condensation nuclei but poor ice nuclei. The scarcity of ice nuclei is what allows supercooled water to persist at all.
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