What is the fine-grained topic of the following text: Another Roddick-ism is calling out the elemental forces at play: “the threats arise without exception from earth (Earthquake), air (Airport, Airport 1975, The Big Bus —which ends up hanging over a precipice, fire (The Towering Inferno, The Hindenburg) or water (The Poseidon Adventure, Juggernaut, Airport ’77).” I can think of an exception (Two-Minute Warning). Only return the topic.
Roddick's categorization of threats in films based on elemental forces.