cataclysm
Cataclysmic variable star, which irregularly increases in brightness by a large factor, then drops back down to a quiescent state (initially called nova)
Cataclysmic pole shift hypothesis, pseudo-scientific claim of past rapid changes of Earth's axis
Ekpyrosis, a conflagration
Pyroclastic flow, fast-moving current of hot gas and volcanic matter
Lahar, violent volcanic mudflow or debris flow
Eschatology, part of theology concerned with the final events of history
Kataklysm, Canadian death metal band
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