The Hollow Earth

Fiction is the form of any narrative or informative work that deals, in part or in whole, with information or events that are not factual, but... rather, imaginary—that is, invented by the author. Although fiction describes a major branch of literary work, it may also refer to theatrical, cinematic or musical work. Fiction contrasts with non-fiction, which deals exclusively with factual events, descriptions, observations, etc. . Realistic fiction, although untrue, could actually happen. Some events, people, and places may even be real. This is termed "faction". It can be possible that in the future imagined events could physically happen. For example, Jules Verne's novel From The Earth To The Moon, which at that time was just a product of his rich imagination, was proven possible in 1969, when Neil Armstrong and Buzz Aldrin set foot on the Moon, and the team returned safely to Earth. Realistic fiction strives to make the reader feel as if they're reading something that is actually happening—something that though not real, is described in a believable way that helps the reader make a picture as if it were an actual event.
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The adventure novel is a genre of novels that has adventure, an exciting undertaking involving risk and physical danger, as its main storyline.... Critic Don D'Ammassa, in the Introduction to the Encyclopedia of Adventure Fiction defines the genre by stating that "an adventure is an event or series of events that happens outside the course of the protagonist's ordinary life, usually accompanied by danger, often by physical action. Adventure stories almost always move quickly, and the pace of the plot is at least as important as characterization, setting and other elements of a creative work." D'Ammassa argues that adventure novels make the element of danger the focus of their story; hence he argues that Charles Dickens' novel A Tale of Two Cities is an adventure novel because the protagonists are in constant danger of being imprisoned or killed, whereas Dickens' Great Expectations is not because "Pip's encounter with the convict is an adventure, but that scene is only a device to advance the main plot, which is not truly an adventure." Adventure has been a common theme since the earliest days of written fiction.
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