Odysseus tells Polyphemus that his name<span> was No Man, or </span>Nobody<span>, to trick the cyclops.
I'd say he did that so the cyclops will not be able to get help from his friends.
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Explanation:
Thunderstorms arise when layers of warm, moist air rise in a large, swift updraft to cooler regions of the atmosphere. There the moisture contained in the updraft condenses to form towering cumulonimbus clouds and, eventually, precipitation.