Everything you need to understand or teach At the Earth's Core by Edgar Rice Burroughs.
At the Earth's Core offers a diversion of wonder and adventure in which readers may become so enthralled they will forget their real-life troubles.
In the novel a noble-hearted young man participates in a daring experiment and then finds himself in a world inside the Earth, a world called "Pellucidar." Here, David Innes struggles to survive the many dangers of a primitive land, including fierce battles with prehistoric monsters, frightful creatures unknown to the surface world, and numerous other enemies such as evil men and the wicked Mahars. This novel, overall, is good fun and fine entertainment, one of the best works of an author who is very skilled at the art of spinning adventure yarns.