1. Who was John Cleves Symmes?

What was his hollow-Earth theory?

2. Write a history of the belief that the Earth is hollow, ending with modern advocates of that view. You might begin with Edmund Halley, the English astronomer, who in 1692 proposed that the Earth was hollow with a sun at its center.

3. What do most scientists say is actually beneath the surface of the Earth and at the Earth's core? What evidence do they cite to support their views? You may wish to make and include a diagram that illustrates the different geological layers which scientists say lie beneath the surface of our planet.

4. Pellucidar is a vast world, almost equal to the outer Earth in size, allowing for the invention of many different cultures and settings. Write a story that takes place in Pellucidar. Try your hand at making your...